Set of "Prisma" jacket crown porcelain powder, cased with instructions and shade guide, by the Amalgamated Dental Co., London, 1947-1960 Set of "Prisma" jacket crown porcelain powder 1947-1960
Set of de Tray's aluminous porceelain powder, cased, with instructions, by the Amalgamated Dental Co., London, 1955-1970 Set of de Tray's aluminous porcelain powder 1955-1970
