The pictured example of the ETA/Valjoux caliber 7750 is one of the most recognizable and widely used automatic chronograph watch movement. It was based on the manual wind Valjoux caliber 7733, which itself was based on the Venus 188. Today, it is part of the “Mecaline” line of ETA movements. It was officially introduced t0 the watch world around 1973/1974 but after the first run was manufactured, the caliber wasn’t produced again until 1985 (thanks to mechanical timepieces gaining popularity once again). The 7750 was partially designed on a computer – a first for the watch industry. 

Specifications

• Brand: ETA / Valjoux
• Caliber Number: 7750
• Based On: Valjoux 7733
• Movement Type: Automatic
• Jewels: 25
• Lignes: 13 1/4”’
• Diameter: 30mm
• Height: 7.9mm
• Power Reserve: ~48 hours
• Lift Angle: 49 degrees
• Vibrations Per Hour: 28,800 (4 Hz)
• Regulator System: ETACHRON
• Chronograph System: Three-plane cam style