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Photo of A&S5201 - Open Work Black Edition calibre

A&S5201 – Open-worked Black Edition

Like all the movements used by Arnold & Son, the A&S5201 calibre has been entirely developed, manufactured, decorated, assembled, adjusted and cased-up at the Manufacture in La Chaux-de-Fonds. This calibre draws on a pair of large barrels and an oscillating frequency of 3 Hz, which delivers a 90-hour power reserve. In addition, its depth of 4.18 mm is exceptional for a skeletonised movement, as these types of calibres usually retain a certain thickness to compensate for their open-worked designs, which typically weaken their structures.

Diameter
31.10 mm
Height
4.18 mm
Jewels
24
Power Reserve
90h
Frequency
3 Hz / 21,600 vph
Photo of A&S5201 - Open Work Black Edition calibre
Front view of the calibre
Photo of A&S5201 - Open Work Black Edition calibre
Back view of the calibre