cal. G 1780 automatic winding movement 34 jewels one-minute tourbillon regulator visible at 11 oclock • matte black dial applied Arabic numerals subsidiary dials for 30-minute and 12-hour registers • large stainless steel case concave bezel sapphire crystal case back secured by 6 screws screw down crown flanked by large push down chronograph buttons • case dial and movement signed • a stainless steel Graham twin folding clasp