Longines, No. 9159327, Ref. 37285. Produced circa 1955..Very fine stainless steel, large, keyless, split-seconds keyless watch with 30-minute register. Accompanied by a Certificate of Examination from the National Physics Laboratory dated April 2, 1955.
C. Four-body, bassine et filets, polished, hinged cuvette, crown pushbutton at 12 o'clock for start/stop and return to zero, at 11 o'clock for split-seconds. D. Matte silver with painted Arabic numerals, outer chronograph ring calibrated in 1/5 seconds, Arabic markers, register at 12 o'clock. Blued steel feuille hands. M. Cal 24 ''', 54 mm., rhodium-plated, fausses-côtes decoration, 21 jewels, straight-line lever escapement, monometallic balance, Breguet balance spring, visible split-seconds chronograph work..Dial, case and movement signed..Diam. 64 mm.