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This is a genuine ISA winding stem for 125/127 ultra-thin quartz movements, Swiss made. It connects the crown to the keyless works for time setting functions. Multiple stem options are available: 401-1377 (Tap 10), 401-1464 (Tap 11), 401-1463 (Tap 12). This product is brand new and original, typically requiring cutting to case length during installation.
Compatible Movements：ISA 125（rectangular）、ISA 127（round, 17.2mm）
Origin：Swiss Made
Stem Part Numbers：401-1377（Tap 10） / 401-1464（Tap 11） / 401-1463（Tap 12）
1. Is this winding stem an original ISA genuine part?
Yes.
2. Which movements is this stem compatible with?
It fits ISA 125 (rectangular) and ISA 127 (round) ultra-thin quartz calibers. The ISA 127 measures 7.75 ligne (17.2mm) with only 1.4mm thickness.
3. How do I choose the correct Tap specification?
This stem is available in Tap 10, Tap 11, and Tap 12 specifications. Select based on your crown’s internal thread specification.
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