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This is a genuine ISA second wheel for the 8171 movement, made in Switzerland, designed for the ISA 8171 quartz chronograph caliber. It serves as the core drive component of the chronograph seconds system, located at the 10 o’clock position (10H) , responsible for driving the central chronograph seconds hand for precise timing functions. 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：Second Wheel (Chronograph Seconds Drive)
Origin：Made in Switzerland
Quality：Genuine original, brand new
Function：Drives the central chronograph seconds hand
1. Is this second wheel an original ISA genuine part?
Yes. It is an original ISA factory part, made in Switzerland.
2. Which movements is this second wheel compatible with?
It fits the ISA 8171 series quartz chronograph movements (including 8171/201, 202, 203, 204 variants) . The 8171 features a 3-eye layout: 60s counter at 2H, date/moon at 6H, and 30min totalizer at 10H . Verify your movement main plate is marked 8171 with specific sub-version.
3. What happens if the second wheel is damaged?
The second wheel is the core drive component of the chronograph seconds system. Damage can cause the chronograph seconds hand to stop, skip, or fail to reset. As a continuously driven component, timely replacement is recommended. If the chronograph hand is not zeroed, you may perform a zero reset by pulling the crown to position 2 and pressing A/B buttons .
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