Speake-Marin caliber

Speake-Marin SMA03

Sourced specifications: automatic winding, 52-hour power reserve, 28,800 vph, and 31 jewels. Watchfari lists 6 references using the Speake-Marin SMA03, spread across 1 brand and 4 families. Every sourced case diameter here is 38 mm. Every sourced movement here is automatic. The most common sourced case material is titanium (3 of 4).