The Richard Mille RM 75-01 Flying Tourbillon Sapphire is a manually wound, limited-edition watch built around a central idea: make the movement visible through a case whose bezel, caseband and caseback are sapphire. Its RM75-01 calibre displays hours and minutes, with a flying tourbillon and flying barrel presented as suspended elements. Richard Mille publishes a power reserve of about 65 hours, and the May 2025 release lists 35 watches across three color expressions.
What is the Richard Mille RM 75-01?
It is a hand-wound flying-tourbillon wristwatch with hours and minutes, identified by Richard Mille as the RM75-01. Rather than treating the transparent case as a window around a conventional movement, the design makes the sapphire structure and exposed movement architecture part of the same visual composition. The brand describes the flying tourbillon at 6 o’clock and the flying barrel as two visually suspended elements.
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Richard Mille says the bezel, caseband and caseback are cut and milled from solid sapphire blocks, with no external structural frame supporting the assembled sapphire components. The design places the movement in view while leaving the case itself visually unobtrusive. These descriptions and technical figures are manufacturer specifications, not results from independent performance testing.
How does the sapphire case work?
The tripartite case uses sapphire for its bezel, caseband and caseback. Richard Mille specifies sapphire hardness of 2,000 Vickers and says machining the case takes more than 1,000 hours. The bezel-side sapphire is listed at 1,800 Vickers and 2.30 mm thick; the caseback sapphire is also 2.30 mm thick.
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The case measures 32.90 × 46.75 × 14.35 mm. Its upper flange is 5N red gold, with polished and microblasted steel markers. For assembly, Richard Mille specifies 24 grade 5 titanium spline screws and 316L stainless steel washers.
The movement’s baseplate and bridges are grade 5 titanium, finished with 5N gold and grey PVD treatments. The brand also lists hand anglage and polishing, sapphire-blasted milled sections, polished contact points and burnished pivots.
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What are the RM75-01 movement specifications?
| Specification | Published detail |
|---|---|
| Calibre | RM75-01, manually wound |
| Functions | Hours and minutes |
| Movement dimensions | 29.71 × 20.78 mm; 5.45 mm thick |
| Power reserve | About 65 hours (±10%) |
| Frequency | 3 Hz (21,600 vibrations per hour) |
| Jewels | 18 |
| Tourbillon | Variable-inertia flying tourbillon at 6 o’clock |
| Balance | Free-sprung, with four adjustment screws |
| Barrel | Flying barrel; one revolution in 5.2 hours |
These figures are published by Richard Mille; the power reserve is a stated specification, not an independently verified timing or endurance result. The brand’s official product specifications are available on the RM 75-01 product page.
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A May 2025 release published by Europa Star describes three limited editions, totaling 35 examples:
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| Expression | Color treatment | Edition count |
|---|---|---|
| Clear sapphire | Clear sapphire case | 15 |
| Lilac | Lilac lower bezel | 10 |
| Blue | Blue lower bezel | 10 |
The three expressions share the published calibre and case specifications; the release does not describe different movement performance among them. These edition counts come from the May 2025 press-release information carried by Europa Star.
Is the RM 75-01 water resistant?
Richard Mille specifies water resistance to 30 metres, with two nitrile O-ring seals. That rating is not a basis for describing the watch as a dive watch. The published information does not establish a particular recommended activity or servicing interval, so owners should confirm use and care guidance with the brand or an authorized representative.
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How much is the RM 75-01 Sapphire?
The cited product information and May 2025 release do not establish a current retail price, regional allocation, remaining availability or active resale listings. Contact Richard Mille or an authorized representative for current pricing and availability. Limited production alone does not demonstrate a particular resale value or investment outcome.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
