In the beginning of 2005, to pay tribute to George Graham fantastic heritage to the watch history Graham London decided to add a magnificent collection; a symbol of tradition and passion for mechanical arts : the TOURBILLON.
The Tourbillograph was created and constructed in the vein of Graham’s “high adrenaline” timepieces: gutsy, sporty, functional, provocative yet very sophisticated. The complete construction of the cases is unique and allows a fascinating look through the refined mechanism of these fabulous “Tourbillons”. The Tourbillographs indicate on top of the hours, minutes and sweep seconds, located at the centre of the Tourbillon, two chronograph counters for the Minutes and Hours.
The off-centre (“British eccentric”) construction of the Tourbillon has the advantage of being lighter and, therefore, more reliable including a better shock resistance. The enemy of the Tourbillon is the weight of its “cage” . The cage weighs 0.485 gr. and is made of 48 pieces. The double bridge construction on both sides, front and back, is classical “à la Breguet” and is clearly more reliable than a “Tourbillon Volant”.
The high frequency of the balance wheel: 28’800 alternations per hour permits an easier adjustment and a more precise running. (Breguet 18’000, Blancpain 21’600 but Zenith 36’000). The re-inforced Incabloc anti-shock system, including spiral, balance, escapement wheels and anchor, guarantee an excellent shock resistance that is vital for a “sports” Tourbillon with chronograph function.
The off-centre construction with its unique “Coq” and upper bridge are shaped in the tradition of English high precision timepieces reminiscent of the 19th century, hence a “bow” to Graham’s heritage. A larger balance wheel that allows higher degree of precision.
All the Chronofighter RAC Trigger are powered by a column-wheel chronograph movement ensuring greatly enhanced precision, know as “roue à colonne” in french, hence the cryptic three letters “R.A.C.”. Made in 18 K 5N red gold, all feature a domed sapphire crystal on the front and a flat see-through back, highlighting the truly magnificent mechanism of these unique time machines.
Exquisite dials in form and function ooze the Graham spirit and underline our knack for refined details. The Chronofighter Trigger Tourbillograph comes in 5 different dials. Exquisite hand-sewn, black or brown, large scale alligator bracelets complement the great look of these latest Graham creations.
Calibre G1780. Tourbillon with chronograph function, featuring 2 counters: one for the 12 hours and the other for the 30 minutes. The sweep second is indicated by the large red hand. 42 hour power reserve.
Oscillating weight, bridges and plates: plated black gold.
Counterpoise: 18k gold secured by 10 polished screws.
Oscillating weight and chronograph bridges: Sunburst pattern
Bridges and plates: circular-grained.
Brass and steel components: polished-chamfered
Upper bridge of the Tourbillon: 18K 5N gold secured with 2 polished screws.
Lower bridge: satin-finished.
“Roue à colonnes”: polished and black PVD coating
5N red gold. 18K white gold start/stop lever
46 mm diameter. Thickness 16.74 mm. Standard pull-out crown.
Domed sapphire crystal with anti-reflective coating on the both sides; domed case-back with flat sapphire crystal. See-through case-back secured by 6 screws.
Water resistance: 50 metres. (5 atm)
White luminescent red gold hour and minute hands. 12 hour and 30 minute counter chrono hands in red
Red sweep second with luminescent white tip
Hexagonal center of the 30 minute counter: reference to the hex screws used for chronograph release mechanism
- Tourbillograph Trigger Ruthenium: Ref. 2TTAR.B02A.C86B – Dial: “Côtes de Genève”. Ruthenium effect. Black colour for both 12 hour counter (at 12 hour) and 30 minute counter with hexagonal center (at 9 hour). Black large scale croco strap. Black rubber strap may also be available. Pin buckle 18K 5N red gold.
- Tourbillograph Trigger Raven Black: Ref. 2TTAR.B01A.C86B – Dial: “Côtes de Genève”. Black dial. Black colour for both 12 hour counter (at 12 hour) and 30 minute counter with hexagonal center (at 9 hour). Black large scale croco strap. Black rubber strap may also be available. Pin buckle 18K 5N red gold.
- Tourbillograph Trigger Havana: Ref. 2TTAR.C01A.C87B – Dial: “Côtes de Genève”.“Havana” brown dial. Brown colour for both 12 hour counter (at 12 hour) and 30 minute counter with hexagonal center (at 9 hour). Brown large scale croco strap. Black rubber strap may also be available. Pin buckle 18K 5N red gold.
- Tourbillograph Trigger Carbon Black: Ref. 2TTAR.B04A.C86B – Dial: Black. Carbon fibre for both 12 hour counter (at 12 hour) and 30 minute counter. Black large scale croco strap. Black rubber strap may also be available. Pin buckle 18K 5N red gold.