A New Sapphire Vision For MB&F: Horological Machine N°9 aka HM9-SV

A New Sapphire Vision For MB&F: Horological Machine N°9 aka HM9-SV

First seen in 2018, MB&F’s Horological Machine N°9 – nicknamed HM9 ‘Flow’ – was a tribute to the extraordinary automotive and aeronautic designs of the 1940s and 50s.

The latest iteration of HM9 is the ‘Sapphire Vison’ – with an outer hull of sapphire crystal and precious metal, curved and bubbled, fitted together in three parts, sealed with a proprietary combination of patented three-dimensional gasket and high-tech compound bonding process. 

Two fully independent cantilevered balances channel data into a differential that turns two heartbeats into one coherent time-pulse. Ultra-precise conical gears efficiently turn the engine’s energy and information current through a 90° angle to feed the time display on a sapphire crystal dial, marked with Super-LumiNova.

On the reverse, co-axial beneath each of the balances are propellers: twin turbines that spin freely as an element of pure visual interest, waiting for someone to begin a new type of exploration. HM9-SV takes us to the depths of the ocean.

“The most beautiful movement we’ve created to date.”

Maximilian Büsser, Founder, MB&F (describing the engine inside HM9) 

In order to seal the sapphire crystal exterior components into one watertight case, new solutions had to be created. A patented three-dimensional rubber gasket was already used in the original HM9 Flow to ensure water resistance when the tripartite case was bolted together. 


HM9 Sapphire Vision comes in four editions, each limited to only five pieces:

Two editions with 18K 5N+ red gold frame, combined with a NAC-coated black or PVD-coated blue engine;

Two editions with 18K white gold frame, featuring a PVD-coated purple or red gold-plated engine.


Manual-winding in-house movement
Two fully independent balance wheels with planetary differential
Frequency: 2.5Hz (18,000bph)
Single barrel with 45-hour power reserve
301 components, 52 jewels
Hours and minutes on vertical dial display
Dual spherical turbines under the movement
Shock-absorbing helicoidal springs linking the movement to the case


‘SV’ editions in sapphire crystal with frame in 18K white or red gold (5N+).
Hour/minute dial in sapphire crystal with anti-reflective treatment and Super-LumiNova on the numbers and indexes.
Dimensions: 57mm x 47mm x 23mm
52 components
Water resistant to 3ATM (30m)
Unique assembly process of the three sapphire crystal case parts with a patented three-dimensional gasket and high-tech bonding compound.

Sapphire crystals

Total of five sapphire crystals treated with anti-reflective coating: three crystals for the main components of the case, one crystal covering the dial, and one crystal for the dial itself.

Strap and buckle

Hand-stitched brown or black alligator strap with red or white gold folding buckle matching the case.

For more information please visit https://www.mbandf.com/en

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