MB&F-Horological Machine N.3 Frog X


When MB&F’s Horological Machine N.3 (or the simpler HM3) was launched in 2010, its disruptive design caused a lot of discussion among watch enthusiasts.

The two rotating “eyes” of this watch indicate the hours and minutes, while the large “mouth” shows the swinging MB&F Tomahawk rotor, hence the nickname “frog”.

Ten years later, the Swiss brand celebrated the tenth anniversary of one of its most iconic models with the new Horologic Machine N. 3 Frog X.

The transparent case of Frog X measures 48.3 mm x 52.7 mm x 17.5mm and is completely made of sapphire crystal. Sapphire crystal is one of the hardest minerals known. It is necessary to use tools with diamond tips or special high-tech hard Only by milling a high-quality alloy drill can the challenge be truly created. In fact, the individual sapphire domes not only need to be uniform in size, but must also be exactly the same in thickness and curve to avoid any possible optical distortions during the reading time.

The two rotating domes made of aluminum are as light as possible, indicating the hours and minutes.

The Super-LumiNova segment is used under the battle axe and on the hour and minute domes to enhance readability in harsh light conditions while providing eye-catching glasses.


The HM3 FrogX 10th Anniversary Limited Edition is available in 3 versions, each with 10 pieces, with blue, purple or turquoise rotors, and colors that match the Super-LumiNova and housing gasket.

HM3 Frog X integrates the HM3 engine in its MegaWind Final Edition version, which replaces the date display with an extended rotor.

This self-winding movement is composed of more than 300 refined high-precision parts, built by the award-winning watchmaker Jean-Marc Wiederrecht, and based on Girard-Perregaux ) The movement beats at a frequency of 4 Hz (28,800 vibrations per hour).

In order to provide an enlarged view of the 22k gold and titanium winding tourbillon and balance wheel, the movement is actually upside down. The two 22K gold blades of the MB&F Tomahawk rotor constitute the so-called “mysterious” rotor, because they look symmetrically balanced, rather than obviously eccentric mass, they seem to ignore the laws of physics. This is achieved by machining the bottom surface of one of the gold blades to a very thin edge, thereby reducing its quality.

This fashion watch is water-resistant to 30 meters/90 feet and is paired with a hand-stitched alligator leather strap with a custom titanium folding clasp.