A rare and impressive giant glass ball timepiece Retailed by Tiffany and Company, New York circa 1900 The French made eight-day movement with vertically planted platform lever escapement and pivoted armature enclosing motionwork for the keyless winding and hand setting functions to the backplate, the 7 inch diameter silvered brass Roman numeral dial with steel spade hands and retailer's signature TIFFANY & Co., NEW YORK to centre, the three-piece watch-type case with solid hemispherical front and rear glasses incorporating flatted area towards the base at the back to allow the timepiece to stand at an angle, each set into deep gilt brass collars attached to the centre ring enclosing the movement with knurled winding/hand setting crown and large pivoted suspension ring to top, overall diameter 20cm (8ins); 22cm (8.5ins) high excluding suspension ring.