Matrix retainer, Ivory No. 1, chrome plated steel, by the Dental Manufacturing Co., England, 1930-1960 Matrix retainer 1930-1960
No. 9 matrix retainer with selection of bands, by Ash, England, 1960-1970 No. 9 matrix retainer with selection of bands 1960-1970
Matrix retainer, Ivory No. 1, chrome plated steel, by Cottrell and Co., London, 1930-1960 Matrix retainer 1930-1960