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This is a genuine TMI/Seiko winding stem for the PC21 movement, made in Japan. It serves as the critical mechanical component connecting the crown to the keyless works for time setting and manual winding functions. Featuring Tap 10 (0.90mm) specification and 16.9mm length. This product is brand new and original, and typically requires cutting to case length during installation.
Part Number：354-122
Compatible Movements：PC21, PC20, VH21 and PC21J/PC21S variants
Origin：Made in Japan
Quality：Genuine original, brand new
Thread Spec：Tap 10（0.90mm）
Total Length：16.9mm
1. Is this winding stem an original TMI/Seiko genuine part?
Yes. It is an original Seiko factory part, made in Japan.
2. Which movements is this stem compatible with?
It fits PC21, PC20, VH21 three-hand quartz calibers, as well as PC21J and PC21S variants. The PC21 measures 6¾×8 ligne (15.30×17.80mm) with 3.15mm thickness.
3. Does the stem need to be cut during installation?
The stem has a length of 16.9mm 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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