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Arpal One by Laurent Ferrier and URWERK for Only Watch 2017 Unique Piece

Two Swiss independent luxury watch firms – Laurent Ferrier and URWERK – have joined hands together to create Arpal One, a one of a kind horological masterpiece in support of the Only Watch auction in aid of the battle against Duchenne muscular dystrophy.

Its special case featuring aero-dynamic curves was designed by Laurent Ferrier. The case was shaped from an exclusive alloy called ARPAL+, specifically developed for this unique watch. ARPAL+ consists of 75% precious metals and resists wear and scratches better than white gold or steel. Its colour never fades, nor does it oxidise. This alloy was first developed for the electronics industry where it is much appreciated for its strength and because it is easily worked.

The polished case of the Only Watch by Laurent Ferrier and URWERK reflects light like no other and seems to sparkle. In contrast, URWERK’s movement was created with every restraint. Unlike the case, it is almost self-effacingly colourless. The four hours satellites are in a matt pearly grey with diamond-polished outlines while the hours and minutes markers are painted in white SuperLuminova.

The time is shown by four satellites, each bearing three hours numerals, which successively sweep past the track of minutes. This original and intuitive way of telling the time is aided by a cover in polyetheretherketone, a thermoplastic known as PEEK, which hides the satellites that are not engaged in indicating the time. The satellites turn on a hidden carrousel, at the heart of the successive passage of the hours.

Technical details
Model: Arpal One by Laurent Ferrier and URWERK for Only Watch 2017
Unique piece

Calibre: Self-winding UR5.03 governed by a double turbine
Jewels: 52
Frequency:  28,800v/h – 4Hz
Power reserve:  48 hours
Materials: Satellite hours turned on Geneva crosses in beryllium bronze; Orbital structure in PEEK (Polyetheretherketone); Carrousel and triple baseplate in ARCAP.
Finishes: Circular-grained baseplate, sandblasted satellites, brushed carrousel, chamfered screw slots

Wandering hours, minutes
Numerals painted in SuperLuminova

Materials: Arpal+
Dimensions:Width 40,9mm, length: 60,8mm, height: 20,7mm
Glass:Sapphire crystal
Water resistance: Pressure tested to 30m/3ATM

Sand-coloured leather, hand stitched with matching thread

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