Montblanc MB R100

Caliber MB R100 is an in-house automatic chronograph manufactured by Montblanc. Introduced in 2008, it features a vertical clutch and operates as an integrated monopusher chronograph with a single pusher. The design incorporates rotating chronograph discs rather than traditional hands. Used exclusively in the Nicolas Rieussec collection, the caliber was discontinued after approximately a decade in production.