Sonic Factory Richard Mille RM 055 43mm Synthetic Crystal Rubber Strap Skeletonized White Dial

Product Detailed Description

Sonic Factory Richard Mille RM 055 Skeleton 43mm Watch

The Sonic Factory Richard Mille RM 055 combines a 43mm synthetic crystal case with an openworked mechanical layout and manually wound RMUL2 movement.

This configuration features an RMUL2 manual-winding mechanical movement, displaying hours, minutes and central seconds through a skeletonized layout. A sapphire crystal with anti-reflective coating protects the display, while a natural rubber strap and folding clasp complete the sports-oriented configuration.

The transparent or translucent character of the synthetic crystal case works together with the openworked movement to make the internal mechanical architecture a central part of the watch’s appearance.

43mm Synthetic Crystal Case

The watch features a 43mm synthetic crystal case.

Unlike conventional stainless steel or ceramic construction, the crystal-style case material allows the mechanical architecture to remain more visually prominent from different viewing angles.

The 43mm dimensions provide a substantial wrist presence while leaving sufficient visual space for the skeletonized movement.

Crystal-based case materials should be handled carefully. Abrasive contact, concentrated impacts and aggressive chemical cleaners should be avoided to help preserve the surface and transparency of the case.

Skeletonized Movement Display

The RM 055 uses a skeletonized movement display rather than a conventional closed dial.

This openworked architecture exposes much of the movement structure and allows mechanical components to form part of the visual design.

The hands are positioned above this mechanical background, creating depth between the time display and the exposed movement components.

RMUL2 Manual-Winding Movement

The watch is equipped with an RMUL2 manual-winding mechanical movement configuration.

The supplied functions include:

Hours
Minutes
Central seconds

Unlike an automatic movement, the RMUL2 configuration requires manual winding through the crown to replenish its stored energy.

When winding the watch, turn the crown gradually. Once a noticeable increase in resistance is felt, additional force should not be applied.

Manual-Winding Operation

A manual-winding movement provides a different ownership experience from an automatic caliber.

Because there is no automatic winding rotor replenishing the movement through normal wrist motion, the watch needs to be wound manually when its stored energy becomes low.

Regular manual winding also allows the wearer to interact directly with the mechanical movement.

Avoid excessive winding force or rapid crown operation, particularly once resistance begins to increase.

Central Seconds Display

The supplied RMUL2 configuration provides a central seconds hand together with the primary hour and minute indications.

Using central seconds keeps the basic time display straightforward despite the visually complex skeletonized movement underneath.

The moving seconds hand also provides an immediate visual indication that the mechanical movement is operating.

Sapphire Crystal with Anti-Reflective Coating

The movement display is protected by a sapphire crystal with anti-reflective coating.

Sapphire provides excellent optical transparency and high resistance to everyday scratches.

The anti-reflective treatment is particularly useful on a skeletonized watch because reducing glare improves visibility of both the hands and exposed movement architecture.

Strong direct impacts against hard surfaces should still be avoided.

Natural Rubber Strap

The watch is paired with a natural rubber strap.

Rubber provides flexibility and resistance to everyday moisture while complementing the lightweight and technical character of the case.

The material is also relatively straightforward to maintain compared with conventional leather.

After exposure to sweat or moisture, the strap can be cleaned with fresh water and dried thoroughly using a soft cloth.

Folding Clasp

The natural rubber strap is secured with a folding clasp.

The folding mechanism keeps both sides of the strap connected when opened and provides a convenient closure system for regular wear.

The clasp should be inspected periodically to ensure that its locking mechanism continues to engage correctly.

50m Water-Resistance Specification

The supplied specification lists the watch with 50 meters of water resistance.

Actual water resistance depends on the condition and assembly of the crown, seals, crystal and other case components.

A stated 50m specification should not be interpreted as confirmation that every individual watch has been independently pressure tested to that depth.

Professional pressure testing is recommended before intentional or repeated water exposure.

Product Specifications
Item Specification
Factory Sonic Factory
Collection Richard Mille
Model RM 055
Case Size 43mm
Case Material Synthetic Crystal
Movement RMUL2 Manual-Winding Mechanical
Functions Hours, Minutes, Central Seconds
Display Skeletonized Movement
Crystal Sapphire Crystal
Crystal Treatment Anti-Reflective Coating
Water Resistance 50m Specification
Strap Natural Rubber
Clasp Folding Clasp
Style Manual-Winding Skeleton Watch
Wearing and Care Advice

Wind the RMUL2 manual-winding movement gradually through the crown. Stop applying additional force once a clear increase in winding resistance is felt.

Clean the synthetic crystal case using a clean, soft microfiber cloth. Avoid abrasive polishing compounds and aggressive chemical cleaning products.

The sapphire crystal offers strong scratch resistance but should still be protected from concentrated impacts.

The natural rubber strap can be cleaned periodically with fresh water and dried thoroughly after exposure to moisture or sweat.

Protect the mechanical movement from heavy impacts and strong magnetic fields.

Professional pressure testing is recommended before intentional water exposure.

Frequently Asked Questions
What size is the Sonic Factory Richard Mille RM 055?

The supplied specification lists a 43mm case.

What movement does the RM 055 use?

This configuration uses an RMUL2 manual-winding mechanical movement.

Is the RMUL2 movement automatic?

No. The RMUL2 is specified here as a manual-winding movement, so it requires winding through the crown when additional power is needed.

Does the RM 055 have a skeleton dial?

Yes. This configuration uses a skeletonized movement display, exposing much of the internal mechanical architecture.

What material is the case?

The supplied specification identifies the case as synthetic crystal. A more specific crystal or composite material is not stated, so no additional material designation is assumed.

What type of strap does the watch use?

The watch is paired with a natural rubber strap and folding clasp.

Please identify the merchant when purchasing to prevent buying counterfeit Sonic Factory products.

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