Small Swiss Staybrite stainless steel chronograph Circa 1935

Chronograph with register, tachometer and telemeter by Rolex 
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A very fine, extremely rare and small Swiss Staybrite stainless steel open faced dress watch with olive shaped button chronograph, register, tachometer and telemeter, made in the 1930’s. Rhodium plated 3/4 plate movement, 17 jewels, straight-line lever escapement, mono-metallic balance, selfcompensating Breguet balance spring, index regulator. Black dial, at 12 o’clock, the hour dial with painted gold Arabic numerals, at 6 o’clock, the 30 minute register dial, outer telemeter graduation, at the centre, spiral tachometric scale and original gold lozenge hands. Polished and brushed case, inclined bezel, recessed winding crown. Dial, case, and movement signed.
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Diameter: 36 mm
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Signed: Rolex Fab. Suisse
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Staybrite is the name of a steel alloy containing 0.2% carbon, 18% chromium and 8% nickel. It is a stainless material that takes a fine polish and is therefore often used for making watch cases. It is probably the type of stainless steel that has been most widely used by watch companies, from the 1930’s onwards.