Description

Column wheel chronograph (seconds, 30 minutes and 12 hours counter). Tourbillon mechanism. Hours, minutes, seconds. Calibre G1780, automatic column wheel chronograph-tourbillon, 28'800 A/h (4 Hz), Incabloc shock absorber. Ruthenium blackened movement with Haute Horlogerie finishing. Perlages, sandblasted, manually chamfered and polished bridges and bottom plate, column wheel with polished segments and black low-friction coating, ruthenium oscillating weight with skeletonised rotor and 925 sterling silver segment. 34 jewels. Power reserve: 48 hours. Blackened tourbillon cage: 48 components, 0.485 grams. Off-centre construction at 11 o'clock. Complete see-through tourbillon. Two patents. Double bridge construction with black PVD coated upper bridge. "Black gold" balance. 48 mm steel with black PVD case. Steel with black PVD right hand start / stop and reset pushers with "Clous de Paris" high grip pattern. Steel bezel with black PVD. Domed sapphire crystal, anti-reflective coating on both faces. See-through sapphire crystal case back. Water resistance - 160 feet / 50m. Black dial with tachymeter scale on external ring. Rhodiated hands and numerals. Strap - Black croco. Black ceramic folding buckle. Unlike E-tailers that only provide in-house warranties, Tesoro Jewelers is a full service authorized dealer that offers the Graham Manufacturer's Warranty.