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This is a genuine Hattori/Seiko winding stem (Part No. 354-300) for the PC32/PC32A movements, made in Japan, designed for 3-hand with date quartz calibers. It serves as the critical mechanical component connecting the crown to the keyless works for time setting and date quickset functions. Features Tap 10 (0.90mm) thread specification. Product is brand new and original—the stem typically requires cutting to fit the specific case length during installation .
Part Number：354-300 (supersedes original 354-128)
Compatible Movement：PC32 / PC32A quartz caliber (10½ ligne, 3-hand with date)
Origin：Made in Japan
Quality：Genuine original, brand new
Thread Spec：Tap 10 (0.90mm)
English
1. Is this winding stem an original Hattori/Seiko genuine part?
Yes. It is an original Seiko factory part (Part No. 354-300), made in Japan.
2. Which movements is this stem compatible with?
It fits Hattori/Seiko PC32 and PC32A quartz calibers (10½ ligne, 3-hand with date), with date window available at 3 o’clock or 6 o’clock . The stem features Tap 10 (0.90mm) thread specification .
3. Does the stem need to be cut during installation?
Yes. The stem is supplied at a general length and must be cut to fit the specific case length during installation before attaching the crown. This should be performed by a qualified watchmaker .
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