MB&F caliber HM1
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HM1 description
Raised central one-minute tourbillon, separate hours and minutes, 7-day power reserve.
Balance oscillating at 28,800 bph.
Automatic winding. 22K Gold Battle Axe winding rotor.
Four mainspring barrels in parallel.
Number of jewels: 81 (all functional).
Number of parts: 376 (including jewels).