Fine Swiss stainless steel students’ chronograph Circa 1950

Stainless steel keyless lever watch
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A rare Swiss stainless steel open faced keyless single button chronograph students’  pocket watch, circa 1950. The Swiss lever movement with a cut and compensated bimetallic balance. Silvered dial with Arabic hours, an outer minute track with fifth of a second divisions and Arabic five minute numerals, subsidiary seconds at 6 o’clock, a 30 minute register at 12, blued steel Breguet hands and a center chronograph hand. The brushed and polished case with a single chronograph button to the crown. Dial signed, movement numbered.