JAM TANGAN Tag Heuer

 In 1975, Tag Heuer introduced the Chronosplit, a digital chronograph with dual LED and LCD displays. Later versions featured two LCD displays.

Heuer began using the Valjoux 7750 movement in its automatic chronographs, with the Kentucky and Pasadena models (both introduced in 1977). The Valjoux 7750 movement was a three-register chronograph (with seconds, minutes, and hours), that also offered day/date windows.

In the mid-1970s, Heuer introduced a series of chronographs powered by the Lemania 5100 movement. The Lemania 5100 movements have the minute hand for the chronograph on the center pinion (rather than on a smaller register), greatly improving legibility. The Lemania 5100 movement is considered very rugged and has been used in a variety of chronographs issued to military pilots. There are ten models of Heuer chronographs powered by the Lemania 5100 Reference 510.500 (stainless steel), 510.501 (black coated), 510.502 (olive drab coated), 510.503 (pewter-coated), 510.511 (Carrera dialed acrylic crystal PVD finish), 510.523 (Carrera dialed acrylic crystal stainless steel), as well as models with the names Silverstone (steel case with black dial) and Cortina (steel case with blue dial); the Reference 510.543 was made for the A.M.I. (Italian Air Force) and a special edition (with no reference number marked on the case) was made for AudiSport

SUMBER : TAG Heuer - Wikipedia