Skip to product information
1 of 9


SEIKO 40's Seikosha Precision Cal. New 10A type

SEIKO 40's Seikosha Precision Cal. New 10A type

Regular price ¥0
Regular price Sale price ¥0
Sale Sold out
Tax included.

Introducing Seikosha's "Precision" in the 1940s .

 After World War II, during the period of post-war turmoil, Seiko set up its watch production facilities, and in 1946 began producing the "New Type 10A " movement at the Daini Seikosha Suwa Factory.

This movement is more like a pocket watch than a wristwatch, and its overall structure is similar to that of a pocket watch.

It was nicknamed the "banana-shaped" because the shape of the bridge resembled a banana, and it was produced as Seiko's main movement during the post-war recovery period.


The Seikosha "Precision" we are introducing this time is a watch with the logo name " SEIKOSHA " printed on it, before the company changed its name to the current " SEIKO ".

The dial has a so-called bull's eye design, which was originally designed to improve the visibility of the luminous paint, but thanks to the two-tone black and gold color scheme, it gives the watch a solid feel similar to that of a military watch.

Not only does it look good, but the index uses Arabic numerals, and the large case size makes it easy to read, making it a highly practical design.

The case is plated with 30 micron gold, but over 70 years, it has changed to a bronze color that resembles brass.

The synergistic effect with the aging of the dial has evolved into a watch with a very bitter taste.

The movement is equipped with a hand-wound "new 10A type".

Since the movement is nearly 80 years old, there are very few examples left in working condition, making it an extremely rare movement.


Size: Height: 42.6mm , Width: 36mm , Thickness: 10mm , Weight: 26g .

The size makes it easy for any man to wear.

It has a calm and classic atmosphere, but it also has the solid feel of a military watch, so depending on the strap, it is easy to incorporate into a wide range of styles from formal to casual.


The case and dial have aged well, but there are no problems with visibility or wearability.

The movement is currently operating without any problems, and with regular maintenance, it will be in good condition for continued use in the future.


Product Details
Year of manufacture 1940s
movement Cal. New 10A type / Manual winding
case size Length 42.6 mm (including lugs) / Width 36 mm (including crown) / Thickness 10 mm / Lug width 18 mm / Weight 26 g
case material 30mic GF (case, gold-plated) / SS (back cover, stainless steel)
accessories Watch body/original case/our store warranty (1 year free warranty)
situation Antique (used)
Waterproof function non-waterproof
Note *This product will be overhauled after your order, so it will take approximately 2 to 3 months to ship.
Thank you for your understanding.

*The color may look slightly different on the screen and in real life. note that.

*This product is also sold in stores. Although we update the stock quantity from time to time, there may be times when the product you have purchased is out of stock. Please note that in the unlikely event that there is no scheduled arrival, we may cancel your order.

All of the watches we carry in our store are internally inspected by a professional watch mechanic when they arrive, and are determined to be genuine before being sold, so you can use them with confidence.

When you purchase your watch, we will deliver it to you with a new leather strap.
Please select your desired color from the order selection tab and place your order.
*For products with genuine watch straps or metal bands, the leather strap will not be attached and will be sent separately as a spare.
We will also send you a special case for the watch when shipping.

●Be sure to check the information after purchasing an antique watch●

At Amboy, when we sell antique watches, we do not hand them over to you immediately after receiving your order, but instead request an overhaul (hereinafter referred to as OH) from a professional craftsman, and then deliver the watch after the OH is completed. (Duration is approximately 1-2 months)

Our professional craftsmen, who are certified as watch repair technicians, will completely disassemble your watch, replace consumable parts such as internal gaskets, clean it, lubricate it, and maintain it to the point where it is within ±1 minute per day.
We will also send you our own overhaul certificate, as well as photos of the machine when it was disassembled and serviced, to show you what kind of work was done during the overhauling process at the time of delivery.

Of course, due to the nature of the product itself being a used item, there is no guarantee that it will never break, but we have taken this precaution so that you can enjoy the original performance of the watch and use it with confidence in the future. Thank you for your understanding.

When purchasing a product, we provide a one-year warranty period depending on the model. Even if the product is out of date, we will repair it for a fee. If you don't have a repair shop near you, please feel free to contact us.

View full details