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Despite its striking external appearance, MB&F founder Maximilian Büsser described the engine inside HM9 as “the most beautiful movement we’ve created to date”. Encased in a transparent sapphire crystal shell, the HM9 SV editions are distinguished by propellers, co-axial beneath each of the balances: twin turbines that spin freely as an element of pure visual interest, waiting for someone to begin this new underwater exploration.
