🛠️ Basic Specifications
Manufacturer: TMI (Time Module Inc. / Seiko Group), Japan
Caliber: VK63 / 64
Type: Meca-Quartz*) chronograph movement
Movement type: Quartz base with mechanical chronograph module
Caliber: VK63 / 64
Type: Meca-Quartz*) chronograph movement
Movement type: Quartz base with mechanical chronograph module
📏 Dimensions
Diameter: Approx. 30.8 mm (13½ lignes)
Height: Approx. 5.1 mm
Total hand height: Approx. 7.4–7.5 mm
Stem type: Tap 10
Height: Approx. 5.1 mm
Total hand height: Approx. 7.4–7.5 mm
Stem type: Tap 10
⚙️ Technical Details
Jewels: 0–2 (depending on production version)
Frequency: 32,768 Hz
Battery: SR936SW (394)
Battery life: Approx. 3 years
Chronograph operation: Mechanical reset with snap-back return
Frequency: 32,768 Hz
Battery: SR936SW (394)
Battery life: Approx. 3 years
Chronograph operation: Mechanical reset with snap-back return
⏱️ Functions
Display: Hour / Minute / Small seconds
Chronograph:
Central chronograph seconds
60-minute counter at 9 o’clock
Central chronograph seconds
60-minute counter at 9 o’clock
Additional indications:
24-hour indicator at 3 o’clock
Date at 4:30 position
24-hour indicator at 3 o’clock
Date at 4:30 position
🔧 Hand Bore Diameters
Hour: 1.50 mm
Minute: 0.90 mm
Chronograph seconds (central): 0.38 mm
Chronograph minute counter: 0.37 mm
Small seconds / 24h: 0.32 mm
Minute: 0.90 mm
Chronograph seconds (central): 0.38 mm
Chronograph minute counter: 0.37 mm
Small seconds / 24h: 0.32 mm
📈 Accuracy (factory specifications)
Monthly rate: ±20 seconds
⚒️ Compatibility / Use Cases
Designed for: Sport chronograph watches
Case fitting: Common in mid-size and large chronograph cases
Popular for: Meca-Quartz chronographs combining quartz precision with mechanical chronograph feel
Case fitting: Common in mid-size and large chronograph cases
Popular for: Meca-Quartz chronographs combining quartz precision with mechanical chronograph feel
*) Seiko VK64 meca-quartz chronograph movement (quartz precision with mechanical chronograph feel)
