ETA 7750 Movement
After the takeover by ETA, the Valjoux 7750 was re-named the caliber ETA 7750. This is quite possibly the most successful automatic chronograph movement of all time. The caliber stands out due to its high degree of accuracy and robustness. It has 25 stones, a ball-bearing mounted rotor, and a uni-directional winding mechanism. The 7750 has a 1/8-second counter, a 30-minute counter, a 12-hour counter, 28,800 half oscillations per minute and a power reserve of ca. 44 hours. The loss of accuracy is 1-6 seconds per day. Movement revisions are recommended every 3 to 8 years
TOP Execution
Chronograph mechanism with cams
2 push buttons
Self-winding mechanism with ball bearing
Hours, minutes, small second
Stop second device
Regulator system ETACHRON and regulator corrector
28.800 vibrations per hour; 4 Hz
Chronograph 60 seconds
30 minutes and 12 hours counters
Date and day, corrector
25 Jewels
TOP Ausführung
Chronograph mechanism with cams
2 push buttons
Self-winding mechanism with ball bearing
Hours, minutes, small second
Stop second device
Regulator system ETACHRON and regulator corrector
28.800 vibrations per hour; 4 Hz
Chronograph 60 seconds
30 minutes and 12 hours counters
Date and day, corrector
25 Jewels