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Introducing Omega's "Half Rotor" in the 1950s .

 Omega's early automatic half rotor.

A half-rotor winds the mainspring by making a 3/4 turn instead of a 360 ° rotation of the rotor.

When the rotor rotates, a spring is installed on the opposite side as a shock absorbing device, and when the rotor and spring collide, a characteristic "knock" sound and shock are transmitted.
For this reason, the half rotor is also called the "bumper type".

Although a full-rotation type is better in terms of winding efficiency, it is still a movement that is enjoyed by many enthusiasts, as it is fun to feel the movement as it moves.


At first glance, it looks like an elegant dress watch, with its slightly reddish gold flying Arabic and dolphin hands, but the addition of the wedge index and the three-dimensional Ω mark makes it look very different. It gives a powerful impression.

As the matte black dial ages, a white haze-like pattern emerges, and when exposed to light, the haze reflects, giving it a fantastic appearance.

The case is a strong round case, but the lugs are fancy lugs with gentle curves that give a sense of elegance.

This is a watch with an excellent design that seamlessly incorporates a design with diametrically opposed characteristics, like stillness and movement, into one watch.

The movement is equipped with a 17- jewel automatic winding Cal.351 .
The 350 series is a movement that has been changed to a center seconds system with the second hand located in the center.

Although the diameter is compact at 26.50 mm , it has excellent accuracy, and the fact that the later Cal. 352 was adopted in the higher-end model Constellation shows the high level of basic design.


Size: Height: 44.3mm , Width: 35.6mm , Thickness: 11.4mm .
Although it is the center seconds system used at the time, it is thinner and has a size that is easy for anyone to wear.
It can be incorporated into a variety of styles from formal to casual.
The edges of the case remain firm and the movement is working without any problems.
Comes with our original leather belt.


A half-rotor that shows off a variety of expressions to match your style.
It is because she has aged that she is able to express such a deep expression.
This is a vintage, truly unique Omega.

Product Details
Manufacture year 1950s
movement Cal.351 / 17 jewels / automatic winding
case size Length 44.3mm (including lugs) / Width 35.6mm (including crown) / Thickness 11.4mm / Lug width 18mm
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 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 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.

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