Rare NOS component (“裏押さえ / Ura-osae”) for mechanical Seiko watch movements
This original SEIKO spare part, reference 386180, is a historical component from the mechanical era (Universe series). It is the so-called clutch cap/copribascula (Japanese : 裏押さえ) – a small but functionally important retaining plate within the clutch/winding mechanism.
Due to decades of individual storage in sealed bags, this is genuine NOS material from the early to mid-Seiko mechanical era.
Technical details
Reference: 386180
Name: Clutch Cap / Bascula Cover (“裏押さえ”)
Type: Mechanical functional component
Material: Steel
Condition: NOS (New Old Stock), unused
Origin: Japan, genuine Seiko spare part
Packaging: Vintage bag "SEIKO 純正部品"
compatibility
This part belongs to the SEIKO Universe series (ユニバース) and was used in several mechanical calibers. The complete list of calibers is hardly documented today, but its use in movements of the 38X and 39X families and related basic designs is typical.
For accurate identification, please compare the shape of the part with the original work.
rarity
NOS parts from the Universe mechanical movement line are virtually non-existent today, especially functional small parts like the clutch cap. Ideal for collectors, restorers, and watchmakers who want to authentically restore vintage Seiko models.
