| Brand: | ETA, Valjoux | 
|
|---|---|---|
| Family: | ||
| Height: | 7.90 mm | |
| Jewels: | 25 | |
| Reserve: | 54 hours | |
| Frequency: | 28800 A/h | |
| Winding: | Automatic, Clockwise Automatic Winding | |
| Diameter: | 30.00 mm (13.25 ligne) | |
| Complications: | 2-Button, 24 Hour Hand, Cam Switching Chronograph, Chronograph, Date, Date by Pointer, Day, GMT Hand, Hacking Seconds, Month, Moon Phase, Quick Date Correction | |
| Hands: | 12 Hour Chronograph Hand at 6:00, 24 Hour Hand at 9:00, 30 Minute Chronograph Hand at 12:00, Central 60 Second Chronograph Hand, Central Date Pointer, Central Hour Hand, Central Minute Hand, Day Window at 11:30, Month Window at 12:30, Moon Phase Wheel at 6:00, Small Seconds Hand at 9:00 | |
| Production: 1986 – Current | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Introduced in 1986, the Valjoux (now ETA) 7751 is a cam-operated automatic chronograph with a day/month/date calendar and moon phase indicator. It is similar to the ETA 7750 apart from the revised calendar complications and addition of a 24 hour hand. The display layout is as follows:
- Central hour, minute, chronograph seconds, and date pointer hands
- 12 hour chronograph hand and moon phase disc at 6:00
- Running seconds and 24 hour hand at 9:00
- 30 minute chronograph hand and day and month windows at 12:00
The date and moon phase indicator is corrected using the crown in position 2. The day is corrected using a pushbutton at 10:00. Date correction is not recommended between 8 pm and 2 am, and moon phase correction is not possible between 3 am and 5 am.
Cal. 7751 is used by many other manufacturers, often with additional finishing or complications. Some specific movements based on this include the Ball RR1403, Breitling B21 (without moon phase), Longines L678.2, Omega 1150, Omega 1151, and Omega 3606. A column wheel version is the Longines L687.2. The Sinn SZ03 is a version with a 60 minute chronograph counter.
