A Plaque of Industrial Merit 835/1000 silver and 585/1000 gold, metal and enamels applications Portuguese 19th/20th C. slight fault on the enamels Lisbon mark (post 1985), "Frederico A Costa-Lisboa" mark, Dimensões (altura x comprimento x largura) - 9 x 7,5 cm; Peso - 59 g. Notes: vd. VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Portuguese Goldsmiths and Assay Marks (1887 to 1993)", vol. II. Lisbon: IN-CM, no. 4108 and 4096.