Reference
MB&F HM4 Thunderbolt
Reference HM4 · Titanium
Track MB&F HM4
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About this reference
The MB&F HM4 Thunderbolt was produced between 2010 and 2013, with the original titanium edition limited to 100 pieces. Collectors prioritize this reference for its unconventional aviation-inspired architecture, featuring two parallel jet-turbine pods crafted from Grade 5 titanium and a central sapphire section that requires over 185 hours of machining. The manual-wind HM4 engine consists of 311 components, utilizing two mainspring barrels to drive separate pods for time display and power reserve. This model marked a shift for the brand toward three-dimensional kinetic sculpture rather than traditional watch shapes. On the secondary market, the HM4 Thunderbolt typically trades in the low-to-mid six-figure range, often between $250,000 and $350,000 depending on condition. A notable variant is the HM4 "Razzle Dazzle," which features hand-painted nose art on the titanium fuselage, further increasing its scarcity and value among specialized collectors.
Hammer prices over time
Each dot is a documented public auction sale; click to view the lot. Dashed line marks the current asking median across live listings.
Auction track record
3 documented sales since 2017. Top hammer $285,000 at Phillips New York in 2024. Median hammer: $147,756.
Ranks #2 of 26 MB&F auction lots we track — see all MB&F records.
Live inventory matching this reference
All documented hammer prices
For this reference (and close variants).
| Lot | Year | Hammer | Venue |
|---|---|---|---|
| HM4 · Horological Machine N°4 Thunderbolt | 2024 | $285,000 | Phillips New York |
| HM4 Thunderbolt · Horological Machine No. 4 'Thunderbolt' | 2024 | $147,756 | Bonhams Hong Kong |
| HM4 Thunderbolt · Horological Machine No. 4 Thunderbolt | 2017 | $147,435 | Sotheby's Hong Kong |
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