GREUBEL FORSEY. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD LIMITED EDITION ASYMMETRICAL WRISTWATCH WITH DIFFERENTIAL QUADRUPLE TOURBILLON AND POWER RESERVESIGNED GREUBEL FORSEY, INVENTION PIECE 2 MODEL, NO. 02/11, CASE NO. 02 325, CIRCA 2011Movement: Cal. GF03N, manual, 64 jewels, signedDial: Differential quadruple tourbillon regulator with each inner tourbillon inclined at a 30 angle rotating once every 60 seconds with the outer tourbillon rotating once every 4 minutes, signedCase: Glazed display back secured by 7 screws, 43.5 mm. wide, signed With: 18k pink gold Greubel Forsey double deployant clasp, Greubel Forsey Extrait du Grand Livre and Certificat de Grand Service. This certificate is valid during six months following the date of acquisition of the watch at Christie’s, offering the new owner a free servicing (but not exceeding 10,000 CHF of the retail service price) of the present watch in Greubel Forsey’s workshops, subject to conditions published on the back of the Certificate.