Seiko spare part 354371 (1 piece) – winding stem for caliber 7730A / 7731A / 7740A / 7741A – NOS

Original Seiko spare part 354371 from unused old stock (NOS).
This is a winding stem , suitable for Seiko movements 7730A , 7731A , 7740A and 7741A . These calibers belong to Seiko's mechanical movements of the 1970s, and original spare parts are becoming increasingly rare.

The winding stem is unused, comes from long-term storage, and is in excellent original condition. Ideal for professional servicing or complete restoration of these vintage Seiko calibers.