(Note: Measurements are outside max. dimensions unless stated otherwise).20th Century : Edwardian period plain thread escutcheon.OUTSIDEHeight 20mm. (3/4")Width top 11.5mm. (7/16")Width base 6mm. (1/4")Depth 5.5mm. (3/16")Thickness (variable) 2mm. (1/16")KEYHOLEHeight 17mm. (5/8")Width at top 7mm. (1/4")Width at base 3.5mm. (1/8")Usually glued in or could be pinned from inside flange.