Seiko caliber

Seiko 9S8

Sourced specifications: automatic winding and 55-hour power reserve. Watchfari lists 43 references using the Seiko 9S8, spread across 1 brand and 5 families. Sourced case diameters run from 37 mm to 46 mm. Every sourced movement here is automatic. The most common sourced case material is stainless steel (23 of 26).