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This is a genuine Hattori/Seiko winding stem (Part No. 354-130) for PC10 and PC11 movements, 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 17.0mm length, it is compatible with PC10 and PC11 two-hand quartz calibers. This product is brand new and original.
Part Number：354-130
Compatible Movements：Hattori PC10 / PC11
Origin：Made in Japan
Quality：Genuine original, brand new
Thread Spec：Tap 10（0.90mm）
Length：17.0mm
1. Is this winding stem an original Hattori/Seiko genuine part?
Yes. It is an original Seiko factory part (Part No. 354-130), made in Japan, specifically designed for PC10 and PC11 two-hand quartz calibers.
2. Which movements is this stem compatible with?
It fits Hattori PC10 and PC11 two-hand quartz calibers. Both movements measure 5½ × 6¾ ligne (approx. 15.55 × 13.00mm) and use 319 (SR527SW) batteries. The PC10 and PC11 differ internally (the PC11 has a built-in choke coil), but the stem is identical (354-130) .
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