ETA7750 VALJOUX / DANGDONG CLONE 7750
🛠️ Basic Specifications:
- Manufacturer: ETA SA (Swatch Group), Switzerland
- Caliber: ETA 7750 (Valjoux 7750)
- Type: Automatic chronograph with manual winding and hacking seconds
- Movement type: Mechanical automatic chronograph
📏 Dimensions:
- Diameter: 30.0 mm (13¼ lignes)
- Height: 7.90 mm
- Dial feet positions: Standard ETA layout
⚙️ Technical Details:
- Jewels: 25
- Beat rate: 28,800 vibrations per hour (8 beats per second / 4 Hz)
- Power reserve: Approximately 44–48 hours
- Winding direction: Unidirectional
- Manual winding: Yes
- Hacking (stop seconds): Yes
⏱️ Functions:
- Display: Hour / Minute / Small seconds at 9 o’clock
- Chronograph:
- Central chronograph seconds
- 30-minute counter at 12 o’clock
- 12-hour counter at 6 o’clock
-
- Date: At 3 o’clock
- Day-Date variant (7750-2): Yes
- Quickset date/day: Yes (via crown)
- Hand hole diameters:
- Hour: 1.50 mm
- Minute: 0.90 mm
- Chronograph seconds: 0.27 mm
- Subdials: Usually 0.20 mm
-
📈 Accuracy (factory specs):
- Daily rate: −10 to +15 seconds/day (standard grade)
(Available in multiple grades: Standard, Elaboré, Top, Chronometer)
⚒️ Compatibility / Use Cases:
- Used in: Countless Swiss and luxury chronograph watches
- Popular brands: TAG Heuer, Breitling, Sinn, IWC, Longines, Hamilton. While most brands use the calibre designation 7750, some have given this calibre their own number.For example: Baume & Mercier 13750, Fortis 2001, IWC 790, or Omega 1150-1164.
- Notable for: Reliability, robustness, and easy servicing
- Chronograph control: Cam-actuated system (not column wheel)
- Modular versions: Available with additional complications (moonphase, GMT, etc.)
INFO: The quality levels of Swiss watch movements are divided into movement grades. You can find more information HERE.
