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MB&F’s Horological Machine N°3 Frog turns 10
New Models

MB&F’s Horological Machine N°3 Frog turns 10

Wednesday, 20 January 2021
By The FHH Journal editors
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The FHH Journal editors

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2 min read

Now, 10 years after its debut, HM3 Frog makes its comeback, radiantly exposed in a sapphire crystal case, yet still with a hidden message to be discovered. Presenting Horological Machine N°3 “FrogX”.

For the first time, the HM3 engine is showcased in all its glory, used here in its MegaWind iteration that trades the date display for an expanded rotor. Two paper-thin domes, milled out of aluminium to be as light as possible, indicate the hours and minutes, rotating under markers designed to resemble the lateral pupils of a frog’s eyes. Super-LumiNova accents, like the vivid colours that nature endows upon its feistiest creatures, reveal themselves in fluorescing segments under the rotor and on the time-display domes.

Horological Machine N°3 « FrogX » © MB&F
Horological Machine N°3 « FrogX » © MB&F

If the first HM3 Frog was an animal of land and lake, FrogX brings us into the arboreal realms of the transparent-skinned glass frogs of Central American cloud forests. The transparent case of FrogX is entirely of sapphire crystal, one of the hardest known minerals, and must be milled with diamond-tipped tools or special high-tech carbide bits. Despite MB&F’s experience with the most advanced sapphire-crystal producers (as demonstrated in earlier MB&F creations such as the HM4 Thunderbolt and HM6 Alien Nation), machining the case of HM3 FrogX still provides a considerable challenge. The separate sapphire domes not only need to be uniform in size, they must also be exactly uniform and consistent in thickness and curve so as not to create any final optical distortions in the reading of the time.

Horological Machine N°3 « FrogX » © MB&F
Horological Machine N°3 « FrogX » © MB&F

Those looking at the winding and setting crown of HM3 FrogX, expecting to see the usual battle-axe insignia, will be slightly baffled to find a smooth, highly polished disc (although exceptionally observant individuals may notice a slight irregularity in its reflection of light). At just the right angle, with just the right kind of directional light and just the right receiving surface, the final secret of the fully exposed FrogX is revealed. A secret signal, created by sculpting the metal crown at microscopic levels to allow it to reflect light in highly specific ways, is the key to unlocking the MB&F battle-axe.

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