LONGINES REF 7981/1 CHRONOGRAPH STEEL
Longines, Ref. 7981/1. Made circa 1960
Fine, water-resistant, stainless steel wristwatch with round
button chronograph, register, tachometer, revolving graduated
black bezel and a modern stainless steel Longines buckle.
Three-body, polished and brushed, concave lugs, screwed-
down case back, bi-directionnal revolving black bezel with
Gloss black with painted luminous Arabic numerals, subsidiary
guilloche dials for the seconds and 30-minute register,
outer minute track with 5-minute radial Arabic numerals,
outermost 1/5th second and tachometer graduations. Luminous
Cal. 335, based Valjoux 236, rhodium-plated, 17 jewels,
straight-line lever escapement, monometallic balance,
shock-absorber, self-compensating flat balance-spring.