Swiss heavy 1/10th split second chronograph Circa 1963

Stainless steel Olympic split second chronograph
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A heavy Swiss stainless steel open faced precision split second chronograph made by Longines, circa 1963. This Olympic chronograph features a polished case with a screw back movement and protective cap. Its silvered dial bears the Longines signature, Arabic hours, minute divisions, an outer double fifth of a second scale, an outermost tenth split seconds chronograph track, a 30 minute counter at 12 o’clock, constant seconds at 6, a gilt leaf hour and minute hand, and blued chronograph hands. The 3/4 plate movement includes a nickelled steel Guillaume balance.
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Diameter: 66 mm
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Weight: 284 g
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Signed: Longines
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Longines claims that the calibre 262 is its most precise movement ever created. The watch can measure up to 1/10th of a second and has a double 1/5th of a second scale. The watch is designed as a fast oscillator with a frequency of 36.000 beats per hour. The steel parts are cut and chamfered to meet the factory’s design standards. The real standout feature, however, is the constant force mechanism used in the watch. Watchmakers such as Harrison, Breguet, Dent and Richard have previously explored the idea of intermediate winding and constant power.