18ct bi-colour gold and diamond 'Crazy Hours' ring, Franck Muller, the 10.50 mm wide open work half round band centring an asymmetrical line of continuous Arabic numerals, pave-set at intervals with brilliant-cut diamonds together weighing approximately 1.00 carat, engraved to the back Franck Muller, size M, signed FM for Franck Muller, maker's marks.