The Armin Strom ARF21 is a hand-wound mechanical movement developed in-house from the ARF15 and finished in Switzerland. It features Incabloc shock protection and is characterized by dual balance wheels connected through Armin Strom's patented Resonance Clutch Spring, which synchronizes the oscillators in opposite directions to improve rate stability. The caliber is used in the Mirrored Force Resonance line, with a variant designated ARF21_ZG featured in the Resonance Zeitgeist model.
Movement Type
Manual Winding
Display Type
Analog
Shock Protection
Incabloc
BRAND
TYPE
Manual WindingSTATUS
In ProductionMANUFACTURE
In-houseCALIBER FAMILY
ARF21COUNTRY
SwitzerlandALSO KNOWN AS
