Skip to product information
1 of 11


OMEGA 50's 30mm caliber Cal.284

OMEGA 50's 30mm caliber Cal.284

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

Introducing Omega's 30mm Caliber in the 1950s .

 The 30mm caliber is hailed as Omega's famous movement.

30mm refers to the diameter of the movement, and one of the regulations for chronometer competitions is that ``the diameter of the movement must be within 30mm .'' Since 30mm is the maximum size specified, Omega uses this size. We are hiring.

The 30mm caliber has achieved remarkable results, starting with its highest ever performance at the Kew Teddington Observatory Competition in 1940 , and going on to record good results at various observatory competitions.

The model equipped with a 30mm caliber has become one of Omega's best-selling and long-selling products, and is truly a legendary movement that still has many fans today.


The Omega we are introducing this time is a model equipped with Cal.268 ( 30mm caliber) movement.

The silver dial has a heavy luster and features dolphin hands and bullet-shaped upright indexes commonly seen on vintage Omega watches.

The indexes are cut and you can see that they are carefully made.

The pet name is not engraved and is commonly called a "non-name", and the dial has a simple configuration with only the upright Omega mark and letters.

The case has a streamlined form with the main body and thick lugs integrated.

The design has a harmonious balance between the calm atmosphere of the dial and the strong case.

The movement is hand-wound with 17 jewels and is equipped with Cal.284 .

It has a high degree of precision that belies its mass-produced appearance, and the red gold plating and detailed workmanship are applied to each part to make the machine look beautiful.

Furthermore, it has excellent durability and maintainability, making it one of Omega's most representative movements.


Size: Height: 40.8mm , Width: 36.2mm , Thickness: 9.8mm , Weight: 30g .

The size fits comfortably on your arm when worn, and the simple design makes it easy to incorporate into a wide range of outfits, from formal to casual.

Also, replacing the belt with a nylon band can completely change the look, so it's fun to change the belt to match your outfit.


In terms of condition, the case has only minor scratches and the edges remain firm.
The windshield is replaced with a new one during the initial check.

The movement has some rust, but will be cleaned and rust removed during overhaul.

It is in good working condition.
There is some slight discoloration on the dial from 6 o'clock to 9 o'clock, but there is no problem with visibility.


Product Details
Manufacture year 1950s
movement Cal.284 / 17 jewels / manual winding
case size Length 40.8mm (including lugs) / Width 36.2mm (including crown) / Thickness 9.8mm / Lug width 18mm / Weight 30g (body only)
case material SS (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 you place your order, so it will take approximately 1 to 2 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 RESUME, when selling antique watches, we do not hand them over 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 OH 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 OH upon delivery.

Of course, since the product itself is 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