Seiko / Seikosha Spare Part – Setting Lever Spring (Keyless Works Spring) for Seiko "Solar" (Cal. 5S) (1 piece) – NOS

Original Seikosha spare part – Keyless works spring (presumably setting lever spring) from unused old stock (NOS) for the Seiko "Solar" (designated on the bag with caliber identification 5S: "5S (ソーラー)"). One single piece is offered, taken from an original "SEIKO WATCH PARTS" bag (original packaging 1 dozen / "1 DZ."); the packaging is stamped "GENUINE SEIKOSHA MAKE".

The spring belongs to the keyless works: it holds or locks the setting parts (setting lever) and ensures the defined locking of the crown positions.

Important note on model designation: "Solar" refers to the mechanical vintage Seiko "Solar" of the 1950s/1960s (caliber 5S) – not a modern, light-powered solar watch.

The part is unused; due to storage, only minor, purely visual traces may be present, which do not impair its function.

Note on assignment: Part type determined by design (no printed part number). Before installation, please compare the shape, dimensions, and fit with the required part or caliber 5S.

Manufacturer: Seikosha / Seiko (K. Hattori & Co., Japan).

Warranty (used) This is an original part (NOS) that has been stored for decades. The limitation period for claims for defects (statutory warranty) is 12 months from delivery.

Note Before installation, please compare the shape, dimensions, and fit with the required part; installation should be carried out professionally.