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The Hattori VX9J/VX9N Movement Day Wheel (12H/3H) is a genuine Japanese-made component designed for these multifunction quartz movements. This day wheel is a key part of the calendar mechanism, responsible for advancing the day display at the 12 o’clock position (or the 3 o’clock position in some variants). This genuine Hattori part is essential for watchmakers to restore accurate day function when the original component becomes worn or damaged.
Genuine Hattori part – authentic Japanese-made component for VX9J and VX9N movements
Calendar mechanism component – advances the day display at the 12 or 3 o’clock subdial
Compatible with both calibers – fits both VX9J and VX9N multifunction quartz movements
Essential for service – commonly replaced when day function becomes irregular or fails to advance
Compatible Movements: Hattori/TMI VX9J, VX9N
Movement Size: 12¾ ligne (approx. 29.5mm)
Movement Thickness: 3.99mm
Subdial Position: Day at 12 o’clock (3 o’clock on some variants)
Hand Sizes: Hour: 1.10mm / Minute: 0.65mm / Seconds: 0.20mm
Battery: SR927SW (395)
Service and repair – replacing worn or damaged day wheels in VX9J/VX9N movements
Calendar function restoration – resolving issues with day hand advancement
Suitable for professional watchmakers and experienced repair technicians
1. Is this a genuine Hattori part?
Yes, this is a genuine Hattori (Seiko/TMI) part made in Japan. The VX9J and VX9N are multifunction quartz movements produced by Seiko Epson, featuring day, date, and 24-hour subdials.
2. How does the day wheel function in the movement?
The day wheel is part of the calendar mechanism that advances the day hand at the 12 o’clock subdial. In the VX9J/VX9N movements, the day advances automatically through the 24-hour cycle.
3. What are the signs that the day wheel needs replacement?
Common signs include day hand not advancing correctly, incomplete day changes, or visible wear/damage during inspection. A qualified watchmaker can diagnose these issues.
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