Swiss platinette open faced lever pocket watch Circa 1920

Platinette open faced watch by Rolex
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A Swiss open faced platinette lever pocket watch, circa 1920. The watch features a mechanical lever movement. It has a white enamel dial with Arabic radial hour markers, an outer minute track, a subsidiary seconds dial, and blued steel spade hands. The plain case is made of platinette and includes a snap-on case back.
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Diameter: 50 mm
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Signed: Rolex
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PLATINET®, a unique ECI metal, is a combination of platinum and sterling silver alloys that provide a bright white colour and a high lustre finish. PLATINET® captures the brilliant luminescence of the sun.
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The case is in overall good condition, showing signs of use that are commensurate with its age. There is a British admiralty mark on the case back, but it appears to be crudely done—possibly added later. The enamel dial is also in very good condition, with a light hairline extending from the centre arbour to 2 o’clock. The movement is currently running.