Seiko caliber

Seiko 4R36

Sourced specifications: automatic winding, 41-hour power reserve, 21,600 vph, and 24 jewels. Watchfari lists 2 references using the Seiko 4R36, spread across 1 brand and 2 families. Every sourced case diameter here is 42.5 mm. Every sourced movement here is automatic. All sourced cases are stainless steel.