Fine and rare, stainless steel and gold Swiss pocket watch Circa 1940

Stainless steel and gold keyless Rolex pocket watch
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Fine and rare, stainless steel and gold keyless pocket watch with Class A Observatory movement. Accompanied by a chain. Prince imperial Reference 1645, made circa 1940.
Two-body, irregular hexagonal, polished case with snap on case back. Bronze and blue steel baton hands, outer minutes track, subsidiary seconds dial at 6. Black baton hands.
Oval Ultra Prima, rhodium-plated movement with 17 jewels, straight line lever escapement, monometallic balance adjusted to 6 positions, self-compensating blued steel Breguet balance spring, with Rolex patented cap and index regulator.

Dial, case and movement signed.
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Diameter: 41 mm x 37 mm
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Signed: Rolex SA Geneva
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Rolex SA is a British-founded Swiss watch designer and manufacturer based in Geneva, Switzerland. Founded in 1905 as Wilsdorf and Davis by Hans Wilsdorf and Alfred Davis in London, the company registered Rolex as the brand name of its watches in 1908 and became Rolex Watch Co. Ltd. in 1915.  After World War I, the company moved its base of operations to Geneva because of the unfavourable economy in the United Kingdom. In 1920, Hans Wilsdorf registered Montres Rolex SA in Geneva as the new company name (montre is French for wristwatch); it later became Rolex SA. Since 1960, the company has been owned by the Hans Wilsdorf Foundation, a private family trust.