Richard Mille RM 66 Review: The Skull Tourbillon That Defies Convention

Name: Richard Mille RM 66 Review: The Skull Tourbillon That Defies Convention
Item: Richard Mille RM 66
Author: Rina Park

The Richard Mille RM 66 is not a watch for the faint of heart. It’s a flying tourbillon encased in a skeletonized, skull-adorned chassis that screams defiance. Released in 2022 as a limited edition of 50 pieces, this reference channels the brand’s signature blend of haute horlogerie and street-culture edge. For the young collector who’s already amassed a collection of Royal Oaks and Nautiluses, the RM 66 is the next logical step — a statement piece that’s as much about identity as it is about mechanics.

At first glance, the RM 66 looks like a piece of contemporary art. The skull and crossbones motif is not just a dial decoration; it’s integrated into the movement architecture, with the skull’s jaw forming the tourbillon bridge. This is Richard Mille at its most audacious — a watch that doesn’t just tell time but tells a story. And for those who can afford the six-figure price tag, it’s a story worth telling.

But beyond the shock value, the RM 66 is a serious piece of engineering. The flying tourbillon, the skeletonized baseplate, and the use of Carbon TPT and titanium make it both lightweight and robust. It’s a watch that performs as well as it looks, whether you’re at a private auction in Geneva or a rooftop party in Tokyo.

Manufacture History

Richard Mille was founded in 2001 by the eponymous French businessman, with a mission to create watches that were as technologically advanced as they were visually striking. The brand quickly became a favorite among athletes, celebrities, and collectors who valued innovation over tradition. The RM 66 continues this legacy, drawing inspiration from the brand’s earlier skeletonized tourbillons while adding a rebellious skull motif that speaks to a younger, more daring audience.

Movement

At the heart of the RM 66 is the manually wound Caliber RM66, a flying tourbillon movement that is entirely skeletonized. The baseplate and bridges are made from grade 5 titanium, which is both lightweight and corrosion-resistant. The skull and crossbones motif is not an appliqué; it’s machined directly into the movement, with the tourbillon cage forming the skull’s jaw. The movement is hand-finished with anglage, circular graining, and polished screws, showcasing the brand’s commitment to haute horlogerie. The 70-hour power reserve is generous for a single-barrel movement, and the winding feel is smooth and precise.

Specifications

Case Diameter: 42mm
Case Thickness: 12.5mm
Lug-to-Lug: 48mm
Case Material: Carbon TPT
Crystal: Sapphire (front and back)
Water Resistance: 50 meters
Lume: None
Strap: Black rubber with titanium buckle
Clasp: Folding clasp in titanium

Wrist Feel

The RM 66 is surprisingly light for its size, thanks to the Carbon TPT case and titanium movement. At 42mm, it wears larger than the numbers suggest, but the curved caseback and integrated rubber strap ensure a snug fit on most wrists. The skeletonized design means you’re constantly aware of the movement’s presence — it’s a watch that demands attention, but not at the cost of comfort. The rubber strap is supple and secure, making it suitable for daily wear despite its avant-garde looks.

Balance is excellent; the weight is distributed evenly, and the crown at 12 o’clock (a Richard Mille signature) keeps the watch from digging into your hand. It’s not a watch you forget you’re wearing, but that’s the point. Every glance at the wrist is a reminder of the mechanical theater beneath the sapphire crystal.

Accuracy

In real-world use, the RM 66 performs within typical manual-wind tourbillon parameters — expect +5 to +10 seconds per day. The lack of a COSC certification is standard for Richard Mille, but the brand’s in-house regulation ensures reliable timekeeping. The 70-hour power reserve is generous for a single-barrel movement, and the winding feel is smooth with a satisfying click.

Occasions

The RM 66 is versatile enough for daily wear, but its bold design makes it a natural fit for sporty or dressy occasions. It’s not a watch for formal black-tie events (unless you’re trying to make a statement), but it works perfectly with casual or smart-casual attire. The 50-meter water resistance means you can wear it in the rain, but it’s not suitable for swimming or diving.

Wrist Presence

5/5 — The RM 66 is a wrist grenade. The skull motif, skeletonized dial, and Carbon TPT case create a visual impact that’s impossible to ignore. It’s a conversation starter, a status symbol, and a piece of mechanical art all in one. If you want to fly under the radar, look elsewhere.

Reference Variants

The RM 66 was produced in a single variant: a black Carbon TPT case with a skeletonized dial featuring the skull and crossbones motif. The strap is black rubber, and the movement is visible through the sapphire caseback. No other dial or material options were offered, making each piece identical in design.

Family References

The RM 66 belongs to Richard Mille’s family of skeletonized tourbillons, which includes the RM 67-01 (automatic, ultra-thin), the RM 72-01 (chronograph), and the RM 27-03 (Rafael Nadal’s tourbillon). These models share the brand’s signature tonneau case and avant-garde design language.

Other Notable Models by Richard Mille

RM 11-03 — Automatic chronograph with flyback function
RM 35-03 — Rafael Nadal’s lightweight tourbillon
RM 055 — Bubba Watson’s skeletonized tourbillon

Similar Watches

Hublot Big Bang Unico Skull — A skeletonized chronograph with a skull motif, offering a similar rebellious vibe at a lower price point.
Audemars Piguet Royal Oak Offshore Tourbillon — A high-end skeletonized tourbillon from a rival brand, though with a more traditional design.

Homages

Invicta Reserve Skull — A budget-friendly alternative with a skull motif and skeletonized dial, though it lacks a tourbillon and the finishing of the RM 66.

Investment Value

The RM 66 has an MSRP of $450,000, but secondary market prices have already climbed to $400,000–$550,000, with some examples selling for over $500,000 at auction. The limited production of 50 pieces ensures strong demand among collectors, and the watch’s cultural cachet (worn by celebrities and athletes) adds to its investment appeal. For those who can afford the entry price, the RM 66 is a solid long-term hold.

Service Interval

Richard Mille recommends a service every 5 years. The cost is approximately $1,500, and service must be performed by an authorized Richard Mille service center due to the complexity of the flying tourbillon and skeletonized movement.

Pros and Cons

Pros

Unique skull motif integrated into the movement
Ultra-light Carbon TPT case
Flying tourbillon with 70-hour power reserve
Limited edition of 50 pieces ensures exclusivity

Cons

Extremely high price point
Not water-resistant enough for swimming
Lack of lume reduces legibility in low light
Skeletonized design may be too loud for some tastes

Final Verdict

The Richard Mille RM 66 is a masterpiece of horological rebellion. It’s not for everyone — and that’s exactly the point. For the collector who wants a watch that’s as much a statement as a timepiece, the RM 66 delivers in spades. It’s a limited-edition tourbillon that combines technical excellence with a bold, skull-adorned design that will turn heads and start conversations. If you have the means, it’s a worthy addition to any serious collection.