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This is a genuine Hattori winding stem for the Y1 series quartz movements, made in Japan, compatible with Y120 and Y121 calibers. It serves as the critical mechanical component connecting the crown to the keyless works for time setting and manual winding functions. This product is brand new and original, featuring 0.90mm stem diameter for Tap 10 crowns, and typically requires cutting to fit the specific case length during installation.
Compatible Movements：Y120, Y121 and other Y series quartz calibers
Origin：Made in Japan
Quality：Genuine original, brand new
Stem Diameter：0.90mm
Crown Spec：Tap 10
Y120 Size：6¾ × 8 ligne, 2.99mm thick, two-hand (hour/minute)
Y121 Size：6¾ × 8 ligne, 3.00mm thick, three-hand (hour/minute/second)
Battery：Y120 377 / Y121 377
1. Is this winding stem an original Hattori genuine part?
Yes. It is an original Hattori/Seiko factory part, made in Japan.
2. Which movements is this stem compatible with?
It fits Hattori Y120, Y121 and other Y series quartz calibers. The Y120 is a two-hand movement (hour/minute), while the Y121 is a three-hand movement (hour/minute/second)—both use the same stem specification.
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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