{"product_id":"seikoセイコー-70s-56-grand-seiko-56グランドセイコー-cal-5646a","title":"SEIKO 70's \/ 56 GRAND SEIKO \/ Cal.5646A","description":"\u003ctable width=\"100%\" border=\"1\" style=\"width: 100%; height: 548.625px;\"\u003e\n\n\u003ctbody\u003e\n\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\n\u003cth style=\"width: 99.6455%; height: 19.5938px;\" colspan=\"2\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cb\u003e\u003cspan style=\"color: #0f000d;\" color=\"#0F000D\"\u003eProduct Details\u003c\/span\u003e\u003c\/b\u003e\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 39.1875px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eYear of Manufacture\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 39.1875px;\" bgcolor=\"#FFFEFC\"\u003e\n\n\u003cp\u003e1970\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 58.7812px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 58.7812px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eMovement\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 58.7812px;\" bgcolor=\"#FFFEFC\"\u003e\n\n\u003cspan lang=\"EN-US\"\u003eCal.5646A \/ 25 Jewels \/ Automatic\u003c\/span\u003e\u003cbr\u003e\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 58.7812px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 58.7812px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eCase Size\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 58.7812px;\" bgcolor=\"#FFFEFC\"\u003e\n\n\u003cp\u003e\u003cspan\u003eLength 40.8\u003c\/span\u003e\u003cspan\u003emm (including lugs) \/ Width 37.6mm\u003c\/span\u003e\u003cspan\u003e (including crown) \/ Thickness 10.3mm\u003c\/span\u003e\u003cspan\u003e \/ Lug Width 18mm \/ Weight 46\u003c\/span\u003e\u003cspan\u003eg (including band)\u003c\/span\u003e\u003c\/p\u003e\n\n\n\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 58.7812px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 58.7812px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eCase Material\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 58.7812px; text-align: left;\" bgcolor=\"#FFFEFC\"\u003e SS (Stainless Steel)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 39.1875px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eAccessories\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 39.1875px;\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eWatch body \/ RESUME original case \/ Our warranty card (1 year free warranty)\u003c\/span\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 19.5938px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eCondition\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 19.5938px;\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003e Antique (used) \u003c\/span\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\n\u003cth style=\"width: 6.26139%; height: 39.1875px;\" align=\"center\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003eWater Resistance\u003c\/span\u003e\u003c\/th\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 39.1875px;\" bgcolor=\"#FFFEFC\"\u003e\u003cspan style=\"color: #0f000d; font-size: small;\" size=\"2\" color=\"#0F000D\"\u003e Not waterproof \u003c\/span\u003e\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"height: 215.531px;\"\u003e\n\n\u003ctd style=\"width: 6.26139%; height: 215.531px;\" align=\"center\"\u003eNote\u003c\/td\u003e\n\n\u003ctd style=\"width: 93.3841%; height: 215.531px;\"\u003e*This product will be overhauled after your order, so shipping will take approximately 1-2 months.\u003cbr\u003ePlease be aware of this in advance.\u003cbr\u003e\u003cbr\u003e*Please note that the color may appear slightly different on screen than in real life.\u003cbr\u003e\u003cbr\u003e*This product is also sold in stores. We update our stock numbers regularly, but there may be cases where the item you purchased is out of stock. Please note in advance that if there is no plan for restocking, we may cancel your order.\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eIntroducing the 1970 Seiko \"56 Grand Seiko\".\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eIn 1960, Grand Seiko was born with the aim of creating \"the finest domestic wristwatch that could compete globally.\"\u003cbr\u003eIn the latter half of the 1960s, 10-beat models such as the 61GS and 45GS were released, significantly advancing the technology of domestic mechanical watches.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFollowing this trend, the \"56 Grand Seiko\" appeared in 1970.\u003c\/p\u003e\n\u003cp\u003eThe 56GS pursued a thinner movement and ease of everyday use while maintaining high precision.\u003cbr\u003eThis series symbolizes the maturity of domestic mechanical watches, achieving a light, thin, and comfortable fit on the wrist.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"layout-grid-mode: char; mso-layout-grid-align: none;\" class=\"MsoNormal\"\u003e\u003cstrong\u003e■ Dial and Case Design\u003c\/strong\u003e\u003cspan lang=\"EN-US\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \"Grand Seiko Style\" was established by the 44GS, released in 1967.\u003cbr\u003eIt is based on combining distortion-free mirror surfaces, broad flat surfaces, and clear ridges connecting them, to make the watch appear beautiful through light and shadow.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis model also inherits that design philosophy, featuring a bold flat surface on the front of the case, from which sharp lines extend towards the tips of the lugs.\u003cbr\u003eThe result is a three-dimensional case design that powerfully reflects light depending on the viewing angle.\u003c\/p\u003e\n\u003cp\u003eThe dial is silver, showing a soft luster.\u003cbr\u003eSlender bar indices and linear hands are neatly arranged, and the \"SEIKO\" logo at 12 o'clock and the \"GS\" mark at 6 o'clock subtly assert its dignity as a Grand Seiko.\u003c\/p\u003e\n\u003cp\u003eDespite featuring day and date displays, the overall impression of the dial is clean.\u003cbr\u003eBy combining a stylish case design with a refined dial, it achieves both the strong presence characteristic of the 1970s and a calm elegance that is easy to incorporate into daily life.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cstrong\u003e■ Movement\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0762\/8980\/2535\/files\/2026-09-07T180601.273.png?v=1788772774\" alt=\"\"\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eIt is equipped with the automatic movement \"Cal.5646A\" manufactured by Suwa Seikosha.\u003cbr\u003eIt is an 8-beat high-beat movement operating at 28,800 vibrations per hour, using 25 jewels.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWhile 10-beat models with 36,000 vibrations per hour also existed in Grand Seiko at the time, the 56 series pursued a thinner movement while maintaining high precision.\u003cbr\u003eThe thin design, approximately 4.5mm thick, enabled a lightweight case design that fits comfortably on the wrist.\u003c\/p\u003e\n\u003cp\u003eIn terms of functions, in addition to manual winding and a hacking mechanism, it features a day\/date display and a quick-set mechanism.\u003cbr\u003eWith a power reserve of approximately 46 hours, it also ensures practicality for everyday use.\u003c\/p\u003e\n\u003cp\u003eThe Cal.5646A is a highly refined automatic movement that did not just pursue accuracy but also achieved high standards in thinness and ease of use.\u003cbr\u003eIt is a highly complete Japanese automatic movement that Seiko boasted in the 1970s.\u003c\/p\u003e\n\u003cp style=\"layout-grid-mode: char; mso-layout-grid-align: none;\" class=\"MsoNormal\"\u003e\u003cstrong\u003e\u003cbr\u003e■ Styling\u003cbr\u003e\u003c\/strong\u003e\u003cspan lang=\"EN-US\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCase size: length 40.8mm (including lugs) \/ width 37.6mm (including crown) \/ thickness 10.3mm \/ weight 46g (including strap)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eA neat and understated piece combining a silver dial with black leather.\u003cbr\u003eIt naturally complements suits and jacket styles, as well as elegant outfits like shirts and fine-gauge knitwear.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe sharp and distinctive case design provides a good accent for simple coordination.\u003cbr\u003eIt is also recommended for styles like a white shirt with slacks, or adult casual wear combining denim with leather shoes.\u003c\/p\u003e\n\u003cp\u003eA black strap gives a sharper impression, while switching to brown or gray creates a softer, lighter atmosphere.\u003cbr\u003eIt is a versatile watch that retains the dignity characteristic of Grand Seiko and can be enjoyed both on and off duty.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"layout-grid-mode: char; mso-layout-grid-align: none;\" class=\"MsoNormal\"\u003e\u003cstrong\u003e■ Condition\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe crystal has been replaced with a new genuine crystal, so it is in clear condition with no scratches or chips.\u003cbr\u003eVisibility is good, allowing you to beautifully appreciate the delicate texture of the silver dial.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWhile there are minor scuffs on the case due to age, there are no noticeable scratches or large dents, maintaining good condition for a vintage watch.\u003c\/p\u003e\n\u003cp\u003eThe GS medallion on the case back is also in good condition with no noticeable wear or loss.\u003cbr\u003eThe movement is currently running smoothly.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan lang=\"EN-US\"\u003e\u003cstrong\u003e■ To ensure a confident purchase\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cspan\u003eAll watches handled by our store undergo internal inspection by a professional watch repair technician upon arrival, and are sold only after being authenticated as genuine, so you can purchase with peace of mind.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWhen you purchase a watch, we will provide a new leather strap.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePlease select your desired color from the order selection tab.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e*For watches with genuine straps or metal bands, the leather strap will be sent separately as a spare and not attached to the watch.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eWe will also send a dedicated watch case at the time of shipment.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"layout-grid-mode: char; mso-layout-grid-align: none;\" class=\"MsoNormal\"\u003e\u003cspan lang=\"EN-US\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan style=\"color: #ff0000; font-size: xx-small;\" size=\"1\" color=\"#ff0000\"\u003e● Important Information After Purchasing an Antique Watch, Please Read Carefully ●\u003cbr\u003e\u003cbr\u003eAt RESUME, when selling antique watches, we do not hand them over immediately upon order.\u003cbr\u003eInstead, we request a complete overhaul (hereinafter OH) by a specialized craftsman, and deliver the watch after the OH is completed. (This takes approximately 1-2 months).\u003cbr\u003e\u003cbr\u003eA specialized craftsman, certified as a Class 1 watch repair technician, will completely disassemble the watch, replace consumable parts such as internal gaskets, clean, and lubricate it.\u003cbr\u003eWe will thoroughly overhaul it to a state with a daily difference of approximately ±1 minute.\u003cbr\u003eAdditionally, upon delivery, we will send our unique OH certificate, along with photos of the watch's disassembly and maintenance during the OH process.\u003cbr\u003e\u003cbr\u003eOf course, due to the nature of used products, there is no absolute guarantee that the watch will never break. However, we take these measures to ensure that you can enjoy the watch's original performance and use it with confidence in the future, so we ask for your understanding.\u003cbr\u003e\u003cbr\u003eWhen purchasing a product, a 1-year warranty period is provided depending on the model. Even for products past their warranty period, we offer repair services for a fee.\u003cbr\u003eIf you do not have a repair shop nearby, please feel free to contact us.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"RESUME","offers":[{"title":"Scotchgard: Black","offer_id":52022519922983,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"Scotchgard: Brown","offer_id":52022519955751,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"Scotchgard: Navy","offer_id":52022519988519,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"Scotchgard: Wine","offer_id":52022520021287,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"Scotchgard: Chestnut","offer_id":52022520054055,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"MIMOSA: Black","offer_id":52022520086823,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"MIMOSA: Grey","offer_id":52022520119591,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"MIMOSA: Brown","offer_id":52022520152359,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"MIMOSA: Dark Brown","offer_id":52022520185127,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"KID: Black","offer_id":52022520217895,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"KID: Khaki","offer_id":52022520250663,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"KID: Orc","offer_id":52022520283431,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"KID: Wine","offer_id":52022520316199,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true},{"title":"KID: Dark Brown","offer_id":52022520348967,"sku":null,"price":283800.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/8980\/2535\/files\/2026-09-07T180922.250.png?v=1788772758","url":"https:\/\/vintage-watch-resume.com\/en\/products\/seiko%e3%82%bb%e3%82%a4%e3%82%b3%e3%83%bc-70s-56-grand-seiko-56%e3%82%b0%e3%83%a9%e3%83%b3%e3%83%89%e3%82%bb%e3%82%a4%e3%82%b3%e3%83%bc-cal-5646a","provider":"RESUME","version":"1.0","type":"link"}