Swiss chronograph with register and tachometer Circa 1950

Yellow gold pocket watch with black dial
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A very fine and extremely rare Swiss, 18K yellow gold pocket watch with black dial, circa 1950. Chronograph, register and tachometer. A polished bassine, the back with engraved presentation inscription. Rolex gilt metal screwed-down cuvette.

Black painted dial with applied yellow gold baton indexes, outer minute and fifths of second divisions, Arabic five minute/second numerals, outermost tachometer scale. Yellow gold baton hands. A rhodium-plated movement, 17 jewels, straight-line lever escapement, monometallic balance, self-compensating Breguet balance spring, index regulator. Dial, case and movement signed.
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Diameter: 48 mm
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Signed: Rolex  Genève