Romain Jerome Skylab

Skylab Speed Metal 48 Skull SLN

There is no such thing as a scary skull, not even one glowing in the dark. And the new Skylab 48 Skull SLN is no exception.

The newest addition to the Skylab 48 Skull collection is all about contrast and surprise. Placed in the center, the skeletonised skull in white Superluminova comes in contrast with the black chrome movement and black PVD-coated steel case. At night, the distinctive RJ skull comes alive, thanks to the blue luminescence, to take over the timepiece and your wrist.

Aesthetical Highlights

The bi-colour case brings contrast to the ensemble with the steel lugs, steel polished paws and the satin-finished black-PVD coated steel bezel.

The Skylab collection is RJ-Romain Jerome’s first skeleton movement characterised by straight vertical and horizontal bridges.

The timepiece is enhanced with a skeletonised skull-shaped applique held by two functional screws to allow maximum transparency of the movement, revealing the barrel at 12 o’clock, the balance wheel at 6 o’clock and the train at 9 o’clock.

Technical Highlights

The Skylab 48 subtly showcases a few technical intricacies. The balance wheel, which is usually visible from the case back, is unconventionally visible at 6 o’clock on the dial. The steel spring, on the case back side, combines three functions, the click, the lever and the trigger.

The movement is composed of three layers formed by the plate, the bridges and the skull applique. The latter is place on the motion-work which makes is not only a distinctive aesthetical element but a functional one as well.

The skull applique is in black chrome filled with white Superluminova “blue emission”.

This special edition is limited to 25 pieces only.

Straight lines skeleton movement

48mm bi-colour steel case



Caliber RJ004-M - Mechanical movement Black chrome skeleton movement
Rate frequency 28,800 vph
Jewelling 21 jewels
Power reserve 48 hours
Water resistance 3 atm (30 meters)
Functions Central hours and minutes
Case 48mm, black PVD-coated steel containing fragments of Apollo 11
Case back Sapphire crystal
Bezel Black PVD-coated satin-finished steel
Dial Black chrome RJ skull applique filled with white Superluminova C1 “blue emission” held by two screws
Hands Rhodiumed and satin-brushed hour and minute hands with Superluminova C1 “blue emission”
Paws Polished steel
Lugs Polished and satin-finished steel
Lug insert Black PVD-coated and sand-blasted steel
Crown Steel screw-lock crown
Strap Black alligator with steel folding clasp
Limited edition 25 pieces
Retail price GBP 15’950.-* / CHF 18’950.- */ EUR 20’950.- */ USD 23’500.-*


About Romain Jerome

Air, earth, sea, collaborations: RJ-Romain Jerome offers the raw energy of imagination to those who are capable of nurturing their most secret dreams. Born at the dawn of the 3rd millennium, RJ-Romain Jerome creates the watches of the new horological era. The magic of the Moon, the power of lava, underwater mysteries and creative collaborations are the poetic driving forces behind this artistic explosion.

Whether through recovering steel from the Titanic or from the Apollo 11 spacecraft, mingling silver with moon dust or sculpting volcano lava, RJ-Romain Jerome asserts its iconoclastic spirit and electrifies tradition by celebrating contemporary legends. Its approach is characterised by a blend of raw character and elaborate refinement, drawing as much on the roar of an erupting volcano as on the writings of H.G. Wells.

A taste for an all-conquering spirit and visionary avant-gardism merge with the realm of the imagination in the “Air”, “Earth”, “Sea” or “Collaborations” collections. These worlds exalt contemporary horizons through a resolutely masculine and contemporary touch. From the ocean depths to the immensity of space, from incandescent lava to age-old minerals and metals, the RJ-Romain Jerome collections are far more than just astonishing watches: they define a new era in watchmaking.

Offering every man a chance to explore a dreamlike new dimension, they also embody the values of their time: a sense of distinctiveness, a need for speed, and a spectacular yet discreetly sophisticated aura of virility.

Air, earth, sea and collaborations: it is now up to everyone to find his own universe, and to give substance to his dream and to his own vision of Time.

November 30, 2016 by MJJ Watches

HYT Skull Bad Boy

Dark side of the Skull

Skull. Bad. Boy.

Need we say more? The name really says it all. Its appearance speaks volumes, yet masks a stunning complexity. There's more to the skull than meets the eye!

Back to black

One would naturally assume that the starting point for the Skull Bad Boy was the skull itself, unveiled by HYT in 2015. Not so. The creative impetus actually came from the new liquid which surrounds it.

This is not a simple aesthetic variation. This opaque black, so simple to look at, took more than 12 months to develop. Like the four other colours developed by HYT, the black version has its own chemical properties. These affect attributes such as viscosity, expansion coefficient and UV resistance.

Its creation meant going back to scratch. The goal? to create a fluid able to adapt to the constraints of an HYT movement, which does not adhere to the wall of the capillary, can hold a meniscus and does not interact on a molecular level with the elements it comes into contact with. The result was achieved in autumn 2015 before undergoing several weeks of testing to confirm its chemical stability.


Chemistry was one concern, but aesthetics was another. Creating a black fluid is not without its problems: whilst the other colours created by HYT are able to reflect all or some of the light they receive, black absorbs everything. The inevitable result is that it is impossible to read the time on the Skull Bad Boy in the dark.

"It was a deliberate decision", explains Vincent Perriard, CEO of HYT. "There were other solutions which would have made the piece visible at night. But if we wanted to play with the darkness inherent to the Skull Bad Boy, we had to go all the way. Night is part of the world of shadows and darkness. Perfectly in tune with the spirit of the skull."


Neuchâtel – Damascus

To go with this new black liquid, HYT wanted to create a skull with the distinctive appearance of Damascus steel, used for knives and Samurai swords. The dial comprises two half-moons decorated with the Clous de Paris stud pattern. Its indexes are created in a Gothic font, complementing the Skull Bad Boy's hard rock look. Its matte black 51 mm case, made from fully microblasted DLC titanium, is attached to a brand new buffed alligator strap with hints of slate grey. It has a velcro clasp so that it can be adjusted to fit on a leather biker jacket", says Vincent Perriard with a smile.

The Skull is coated with a new composite material, created to resemble Damascus steel. A foundry in the Neuchâtel region created the raw material: multiple layers of steel and carbon are folded in on themselves a total of 256 times! This material is cast in batches of five skulls, no two of which will ever be identical.

The result is an ever-changing interplay of its two component materials. The steel is an eye-catching grey, whilst the black colour of the carbon is revealed by a chemical abrasion process. In its unfinished state, the Skull has countless tiny crevasses, evidence of the intense exertions it has undergone in the foundry. HYT levels the surface then covers it with a translucent layer of varnish.

All the functionalities of the original Skull have been preserved. The power reserve indicator sits in the right eye socket, which gets darker as the piece reaches the end of its 65-hour power reserve. The left eye socket houses the seconds disc, permanently, imperceptibly, turning.

The Skull Bad Boy is available as a limited edition of 50 pieces.


Case Black DLC titanium with microblasted finish
Diameter 51 mm
Height/td 17.9 mm
Crown Rubber coated screw-down
Glass Convex sapphire crystal with anti-reflective coating on the dial side
Functions Black retrograde fluidic hours; seconds
Water Resistance Up to 50 metres
Movement Mechanical with manual winding, exclusive HYT calibre
Frequency 28,800 Vph
Jewelling 35 jewels
Bridges/td Hand-bevelled and adorned with Côtes de Genève, rhodium-plated bellows
Power Reserve 65-hour
Dial Unstructured, rhodium-plated with Clous de Paris stud pattern, hours indicated by a black fluid Black hour dial, grey numerals and offset black indices. Seconds disc (left eye), Power reserve (right eye)
Strap Buffed slate grey alligator, velcro clasp with keeper
Ref. 151-DL-43-NF-AS
Limited Edition 50 pieces

HYT in a few words

HYT’s Hydromechanical Horologists have turned fantasy into reality, mixing mechanics and liquid within a wristwatch. While addicted to non-conformism, these alchemists have drawn upon the strictest codes of fine watchmaking, and shattered them.< class="fancy-title">The principle

Two flexible reservoirs with a capillary attached at each end. In one, a coloured liquid; in the other, a transparent one. Keeping them apart is the repulsion force of the molecules in each fluid.

The hours are indicated by the coloured liquid released from a flexible reservoir compressed by a piston. These reservoirs, or bellows, are located at six o’clock and are made from a supple alloy. The first coloured liquid travels through the capillary pushing the transparent one back into its own reservoir and then returning to its original position at six o’clock in what is referred to as a retrograde manner.

The two reservoirs at 06:00. While the first compresses, the second expands, and the other way round, resulting in the movement of the liquid in the capillary. As the hours go by, the coloured liquid advances. The meniscus, in the shape of a half moon, marks the separation point with the other fluid in the tube, indicating the time. At 18:00, the coloured liquid comes back to its original position, going backwards.

The secret that gets the reservoirs going? Two bellows made of a highly resistant, flexible alloy, each driven by a piston. And this is where watchmaking comes in to activate the system.

HYT is continuing its all-encompassing quest for hybridisation by introducing its H2 in 2014, and the very new H3. This timepiece was born of a vision shared by the teams of HYT and Audemars Piguet Renaud & Papi overseen by Giulio Papi.

The Founders & the CEO

Patrick Berdoz, Lucien Vouillamoz, Emmanuel Savioz, Vincent Perriard (CEO)

November 30, 2016 by MJJ Watches