Introduced in 1973, the Valjoux (now ETA) 7750 is a cam-operated automatic chronograph with a day/date calendar. It was based on the Valjoux 7733, which was itself a variant of the Venus 188. The Valjoux 7750 quickly ended production, only to be reborn in 1985 and has become one of the world’s leading watch movements since.
The ETA 7750 is available in Elabore, Top, and Chronometer grades, each with different specifications and materials used. The original Valjoux 7750 had 17 jewels, but modern versions typically have 25. Some versions list 24 jewels. The display layout is as follows:
- Central hour, minute, and chronograph seconds
- Day and date windows at 3:00
- 12 hour chronograph hand at 6:00
- Running seconds at 9:00
- 30 minute chronograph hand at 12:00
Cal. 7750 is used by many other manufacturers, often with additional finishing or complications. Some specific movements that are substantially similar include the Alpina AL-725, Ball RR1402, Bremont BE-50AE, Breitling B13, EDOX 011, Franck Muller FM 7850 CC MB, Graham G1747, Hamilton H-21, IWC 790 family, Junghans J880.1 and J880.2, Longines L667 and L674, Montblanc MB 25.01, Omega 1150 family, Oris 680, and TAG Heuer Calibre 16. Variants include the Bremont BE-17AE (with regatta timer), BE-83AR (flyback), and BE-83AR (retrograde), La Joux-Perret LJP8147-2 (flyback), LJP8201 MPC (monopusher), and LJP8721 (rattrapante), IWC 18680 (tourbillon), IWC 69000 family, IWC 76000 family, Mühle Glashütte MU 9408, Omega 3600 (rattrapante), Panerai OP III, OP IX, OP VIII, OP XIX, OP XXI, OP XXII, OP XXX, OP XXXI, and OP XXXII, and Sinn SZ01.
Since many of the patents have expired, a number of clone movements are also produced. Some include the Sellita SW500 and Shanghai 3LZF2.