Seiko caliber

Seiko 9R6

Sourced specifications: 72-hour power reserve. Watchfari lists 41 references using the Seiko 9R6, spread across 1 brand and 5 families. Sourced case diameters run from 40 mm to 44.5 mm. Every sourced movement here is Spring Drive. The most common sourced case material is stainless steel (14 of 24).