MB&F cracks the challenge of housing Horological Machine N°9 Flow in a transparent crystal case


Hair-brained horologist MB&F has managed to create its 2018 Horological Machine N°9 Flow in a transparent crystal case.

MB&F founder Max Büsser has consistently described the HM9’s movement as his most beautiful to date, but displaying it from every angle in clear sapphire was a technological and mechanical challenge too far until today.

Now, for anybody with $440,000 to spare, the HM9 can be acquired in one of four styles: two with 18ct red gold frame, combined with a NAC-coated black or a PVD-coated blue engine; and two editions with 18ct white gold frame and a PVD-coated purple or a red gold plated engine.


Each is limited to only five pieces.

HM9 Flow is a tribute to the automotive and aeronautic designs of the 1940s and 50s with their flowing lines and futuristic style.

HM9’s sapphire crystal hull is vacuum sealed with a proprietary combination of patented three-dimensional rubber gasket and high-tech compound bonding.

This exposes the HM9’s manual-winding in-house movement with two independent balance wheels located in their own lateral pods.

Those balances drive a vertical time display via a clever set of conical gears, all within a 57mm x 47mm x 23mm form.

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