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This is a genuine Hattori/Seiko winding stem (Part No. 351-819) for VX10/VX11 movements, made in Japan, compatible with VX10 (two-hand) and VX11 (three-hand) calibers, as well as YL60. It serves as the critical mechanical component connecting the crown to the keyless works for time setting and manual winding functions. Featuring Tap 9 (0.90mm) specification and 16.2mm length. This product is brand new and original, and typically requires cutting to case length during installation.
Part Number：351-819 (also referenced as 401)
Compatible Movements：VX10, VX11, YL60
Origin：Made in Japan
Quality：Genuine original, brand new
Thread Spec：Tap 9（0.90mm）
Length：16.2mm
1. Is this winding stem an original Hattori genuine part?
Yes. It is an original Seiko factory part (Part No. 351-819), made in Japan.
2. Which movements is this stem compatible with?
It fits Hattori VX10 (two-hand) and VX11 (three-hand) quartz calibers, also compatible with YL60. Both measure 5½×6¾ ligne, with thicknesses of 2.19mm and 2.49mm respectively.
3. Does the stem need to be cut during installation?
The stem has a length of 16.2mm 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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