1941 Principia, Steel GMT-Master both the date and subsidiary

both the date and subsidiary seconds were removed

contrasting pure silver subdials

platinum case

This design exposes the escapement line assembly and seconds wheel

A Quadruple Tourbillon Secret

1941 Principia, Steel GMT-Master both the date and subsidiaryA 1941 Principia, the first self wound watch from brothers in independent watchmaking Bart and Tim Grnefeld. This example sports a grained salmon dial in a steel case. Its calibre G 06 features bridges constructed of steel, far harder to shape and finish than brass, with the Dutch bell gable shape and distinctive finishing style that built the Grnefeld brothers name. It is the ultimate in minimalist Dutch watchmaking, in a lovely traditional salmon