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This is a genuine ISA 6H wheel for the 8171 movement, made in Switzerland, designed specifically for the ISA 8171 quartz chronograph caliber. It serves as the drive component for the 6 o’clock subdial, typically powering the date wheel or moon phase display depending on the specific vari ant. This product is brand new and original, not a generic replacement part.
Brand：ISA (Swiss)
Compatible Movement：8171 quartz chronograph movement (including 8171/201, 8171/202, 8171/203, 8171/204 variants)
Part Name：6H Wheel (6 o’clock subdial drive)
Origin：Made in Switzerland
Quality：Genuine original, brand new
Function：Drives the 6 o’clock date or moon phase display (varies by sub-version)
Movement Size：11½ ligne (25.6mm)
Movement Height：3.70mm
1. Is this 6H wheel an original ISA genuine part?
Yes. It is an original ISA factory part, made in Switzerland. ISA is a Swiss quartz movement manufacturer, and the 8171 caliber is widely used in various chronograph watches.
2. What happens if the 6H wheel is damaged?
The 6H wheel drives the 6 o’clock subdial. Damage can cause the date to fail to advance, moon phase to stop or misread, affecting the calendar/moon phase function. As a continuously driven component, timely replacement is recommended.
3. Does this part come with installation tools or instructions?
No. This is a single precision component. Installation involves calendar/moon phase disassembly and should be performed by a qualified watchmaker.
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