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This is a genuine ETA E61.111 movement winding stem (Part No. 401-1659 / 529623) , Swiss made, compatible with E61.111, E61.031, E61.041 and other 8¼ ligne ultra-thin quartz calibers. It connects the crown to the keyless works for time setting function. Featuring Tap 10 (0.90mm) thread specification. This product is brand new and original, typically requiring cutting to case length during installation.
Part Number：401-1659 / 529623
Compatible Movements：ETA E61.111, E61.031, E61.041
Origin：Swiss Made
Thread Spec：Tap 10 (0.90mm)
1. Is this winding stem an original ETA genuine part?
Yes.
2. Which movements is this stem compatible with?
It fits ETA E61.111, E61.031, and E61.041 series calibers. The E61.111 is an 8¼ ligne (18.60mm) ultra-thin quartz movement with 1.95mm height, serving as the replacement for ETA 256.111.
3. Does the stem need to be cut during installation?
The stem is supplied at a general length and must be cut to fit the specific case length before attaching the crown. This should be performed by a qualified watchmaker.
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