
Foversta introduces the MB&F HM4 Final Edition, marking the conclusion of the iconic 'Flying Machine' series. This post offers an initial glimpse with exclusive wristshots and the official press release, providing crucial context for collectors interested in the legacy of this avant-garde timepiece. It captures the excitement and design philosophy behind one of MB&F's most distinctive creations.


Stealth. If you look at any plane or boat designed with stealth in mind, they usually look to all intents and purposes anything but inconspicuous. And the stealthier they are, the more strikingly – radar excepted – obvious they are.

A long childhood passion for assembling model aircraft had Maximilian Büsser's walls, cupboards and ceiling covered in small aircraft of every description. Planes were what he saw last thing at night and then again first thing each morning. Many boys sketch supercars and fast planes, but few have the drive and determination to make their dreams come true. Büsser created MB&F to do just that. HM4 was born of the child's fantasy and the man's tenacity.
HM4's engine was entirely designed and developed by MB&F over three years of intensive work. Each of the 311 components was developed specifically; no off-the-shelf components could be used due to the extreme nature of its architecture.

For a timepiece not developed specifically to tell the time, HM4 performs that role superbly. In fact, with its highly legible dials perpendicular to the wearer's wrist, Horological Machine N o 4 might be described as the perfect pilot's or driver's watch.
Inspired by aviation, the case of HM4 imparts speed, power, technology and refinement in equal measure. Visually, the case is composed of three parts: two streamlined jet-turbine-styled pods supported by a horizontal section housing the engine, which is clearly visible through transparent sapphire display panels and the cent ral section of the case itself. Technically there are also three main sections, which include the dials and articulated front lugs; a central section in sapphire offering unprecedented 360° access to the superbly finished engine; and an aft section tapering down to the dual crowns.

Horological Machine N o 4 Final Edition
HM4 Final Edition is a limited edition of 8 pieces in blacken ed titanium
Three-dimensional horological engine developed 100% by MB&F
Manual winding with two mainspring barrels in parallel
Power reserve: 72 hours
Balance frequency: 21,600bph/3Hz
Number of components: 311
Number of jewels: 50
Hours, minutes and power reserve indicator
Hours and minutes on right dial, power reserve indicator on left dial
Separate crowns for time setting and winding
Grade 5 titanium coated with black PVD
Dimensions: 54mm wide x 52mm long x 24mm high
Number of components: 67
Articulation of lugs: 3°
Five sapphire crystals: 2 x dials, 1 x central case section, 2 x display panels (top and bottom)
Hand-stitched calfskin strap with titanium/white gold custom-designed folding buckle attached to articulated lugs
However, I don't see the resemblance of the F 117....I remember the aircraft quite differently...no curves at all but lots of edges... Nonetheless still a stunning piece especially in black....thanks for sharing and congrats to max for another cool timepiece. Regards Jacky
Thanks for these first "in the metal" pics I see Fx. I must say I don't think I like it that much. Maybe because it is quite different, that it disturbs me and that I might need more time. But I think I prefer the rounder shape and purer aesthetics of the normal ones. And it's the kind of watches that love fighting against seelves :p Cheers, Mark
but that is just awful
I guess it is one watch I will not buy. But because it is so difficult to like, for me, I think I now understand why most people did not like my choices for Goldpfeil's AHCI works. I like the round to square manipulation of the metal curves...but again, a tough piece. I will say for myself that I think I am lucky to have chosen the ones in gold. Period.
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