TISSOT T12 CHRONOGRAPH STEEL Tissot, Swiss, Ref. T12. Made in the 1970s. Fine, self-winding, water-resistant, stainless steel wristwatch with round button chronograph, tachometer and a stainless steel Tissot link bracelet with deployant clasp. Two-body, polished, snap-on case back, hooded lugs, recessed crown and buttons. Bicolor silver and black with applied steel indexes, outer 1/5th seconds track and tachometer scale, subsidiary dials for seconds, the 30-minute and 12-hour registers. Luminous steel baton hands. Cal. 788, rhodium-plated, 17 jewels, straightline lever escapement, monometallic balance, shock absorber, self-compensating flat balance spring, micrometer regulator.