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This is a genuine ISA 2H 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 60-second small seconds subdial at 2 o’clock, powering the small seconds hand as one of the core transmission components for proper chronograph function. This product is brand new and original, not a generic replacement part.
Brand：ISA (Swiss)
Compatible Movement：8171 quartz chronograph movement (including 8171/201, /202, /203, /204 variants)
Part Name：2H Wheel (60-second small seconds drive at 2 o’clock)
Origin：Made in Switzerland
Quality：Genuine original, brand new
Function：Drives the 60-second small seconds hand at 2 o’clock
Movement Size：11½ ligne (25.6mm)
Movement Height：3.70mm
Battery：395 (SR927SW)
Layout：3-eye chronograph (60s counter at 2H, date/moon at 6H, 30min totalizer at 10H)
1. Is this 2H wheel an original ISA genuine part?
Yes. It is an original ISA factory part, made in Switzerland.
2. What happens if the 2H wheel is damaged?
The 2H wheel drives the 60-second small seconds at 2 o’clock. Damage can cause the small seconds hand to stop or run incorrectly, affecting chronograph display. Timely replacement is recommended.
3. Does this part come with installation tools or instructions?
No. This is a single precision component. Installation requires professional tools; work should be performed by a qualified watchmaker.
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