Rare original Seiko spare part with reference 388541 . This is the setting lever spring (Japanese: カンヌキ押工 / 裏押え), a central component of the winding and hand-setting mechanism. This spring holds the setting lever in position and ensures the precise switching between winding and hand-setting.
Compatible models
King Seiko First (cal. 3180)
Seiko Cronos (various early hand-wound calibers)
Seiko Champion (e.g. 850, 860)
Other early Seiko hand-wound movements that use part number 388541
Original Seiko Deadstock
This item comes from historical Seiko stock (NOS / deadstock). Never installed, technically flawless, perfect addition for overhauls and restorations of high-quality vintage Seiko models.
Condition
Unused
Genuine Seiko, not a replica
Minimal signs of storage possible, technically flawless
