Four round monocle/pince-nez retainer brooches

Description Of Item: Four round spectacle retainer brooches with pin on rear and light chain spring mounted to recoil into brooch. 3 made by Ketcham & McDougall. 1: Plain black front, brass rear, white chrome pin & spring catch marked 'KETCHALL'. Rear plate marked 'KETCHAM & McDOUGALL / NEW YORK / PATENT FEB 24 03 APR 28 10'. 2: Plain black front, brass rear. 'KETCHAM & McDOUGALL / NEW YORK / PAT. /FEB 24 / 1903'. Simple single pin catch on rear. 3: Black front with inlaid white pattern. Chrome striped back with spring pin catch marked 'KETCHALL'. Backing plate marked 'KETCHAM & McDOUGALL / EAST ORANGE N.J.' 4: Gold coloured round spectacle retainer brooch marked on rear 'STURDY'. 3 Ketchall examples 25mm diam, Sturdy: 24mm. Also gold coloured ear mounted spectacle chain remnant.