LONGINES CAL. 30CH RETOUR EN VOL CHRONOGRAPH STEEL
Longines, movement No. 12608075, Ref. 7412-1, sold to the Longines french
agent S.F.L. on November 11th, 1964.
Fine stainless steel wristwatch with square button "Retour en Vol" chronograph,
Three-body, polished, lapidated lugs, inverted bezel, snap-on case back.
Silver with applied steel baton indexes, subsidiary guilloche dials for the seconds
and the 30-minute register, outer 1/5th seconds/minute track and outermost blue
tachometer scale. Steel baton hands.
Cal. 30CH, rhodium plated, 18 jewels, straight line lever escapement, monometallic
balance, shock absorber, self compensating Breguet balance spring, index regulator.