Romain Gauthier Logical One | BTG | Titanium

No.1 of five

Regular price


Launched in 2005, the independent brand Romain Gauthier set-about creating watches that innovated on past watchmaking techniques and focused on the movement. Technical, innovative, and industrial whilst managing to be beautiful, considered and balanced, Romain Gauthier creates just 60 to 70 watches per year, across all the variations of the Logical One and HMS line-up. This Limited Edition, 'BTG' example - with black ADLC titanium case and grand feu enamel dial - is numbered 1 of 5.

In 2013, the Logical One by Romain Gauthier won the ‘Best Men’s Complication’ award at the Grand Prix d’Horlogerie de Genève (GPHG) - the most prestigious award ceremony in the watch industry.

Developed at the manufacture of Romain Gauthier in the Vallée de Joux, Switzerland, the multi-patented 37 jewel movement features a constant-force device by means of an innovative chain-and-fusee style system running at 4Hz. However, this system differs greatly in its approach from the traditional, where a cone-shaped pulley (fusee) would be wound with a chain attached to the mainspring barrel. Each watch is entirely decorated, assembled and regulated in-house.

In the Logical One, Romain Gauthier replaces the fusee with a slowly rotating snail cam, placing it and the mainspring barrel on the same level. This way, force is always transmitted in a straight line, and only one short line of chain is needed. With the advantage of larger chain links, Gauthier further improves efficiency by constructing the links with low-friction, hard-wearing, synthetic rubies and finally, to eliminate potential friction within the mainspring barrel, the mainspring is placed between synthetic sapphire plates. For the five pieces in the Limited Edition BTG, Romain Gauthier also constructs the upper bridge of the constant-force mechanism in titanium, leaving it in its natural hue rather than the black finishing applied to the movement and bridges.

Even the winding mechanism is unique, wound not with the crown but instead a 18K white-gold pusher set in the case band at 9 o’clock, allowing for a more efficient transmission of energy to the barrel. This provides the watch with 46 hours of power-reserve, quite an achievement for a variation of a fusee and chain, with a power-reserve indicator visible through the exhibition case-back. Looking further at the superb, hand-decorated movement, the rounded chamfers and internal angles of the bridges and main-plate are first to draw the eye. Gauthier also uses specifically designed screws with polished heads, an in-house balance wheel with curved arms and calibrated eccentric weights, and bespoke gear wheels with circular arms for maximum strength.

This Romain Gauthier Logical One BTG is a Limited Edition, with a black Grade 5 titanium case measuring at 43mm x 14.2mm, perfectly balanced and contrasted with the 18K white-gold crown and pusher, as well as a satin-finished side to the lugs. Both the main and subsidiary-seconds dials are offset to the right side of the case, with the constant force device on display to the left, set deep within the watch. This example is fitted with a semi-translucent, deep-blue enamel dial and polished white-gold hands.

A Collected Man is delighted to be able to offer a rare opportunity to acquire this highly desirable Logical One (No. 1 of Five), available as a complete set and fitted on the original black alligator strap (with contrasting grey stitching) and corresponding black titanium buckle, with box and papers from the manufacture.

Viewings can be arranged in Central London by appointment.
Brand: Romain Gauthier
Model: Limited Edition Logical One "BTG"
Movement: mechanical manual-winding
Functions: power-reserve, hours, minutes, sub-seconds
Features: blue-enamel dial, display-back, open-worked dial, 18k white-gold crown and pusher
Case: 43 mm grade 5 titanium
Crystal: sapphire front and back
Bracelet: Romain Gauthier black alligator strap with PVD coated titanium buckle
Year: 2017
Box & papers:
full set - box and papers
This very rare, Limited Edition Romain Gauthier Logical One BTG titanium watch is in excellent condition, has perfect mechanical functionality. It is guaranteed for authenticity and comes with a two-year warranty from A Collected Man.

All of our pre-owned watches have undergone thorough mechanical inspections, including being ultrasonically cleaned, serviced and resealed if appropriate and tested for at least four days, to ensure they meet our highest timekeeping standards. Our pre-owned and vintage watches are covered by a full, or a limited twenty-four month warranty. For example, due to their age, some vintage watches should not be subjected to the same conditions as when they were new. Please see our Terms & Conditions for further information. 

All of our new watches are covered by the warranty from the original manufacturer. Please contact us for further information.

We offer worldwide delivery on all of our watches.

If ordering from the UK or Europe before 1 PM, your watch will be sent the same working day. The courier will depend on the value of the watch, with all watches delivered the next working day.

If ordering from outside Europe, delivery will depend on choice of courier and destination. 

You can cancel your order without giving any reason, within 14 days from the day the watch has been delivered to you.