636 - A ruby and diamond bow brooch

A ruby and diamond bow brooch Gold, fineness .800, and silver, fineness .833 Set with rubies, rose-cut and crowned rose-cut diamonds Porto hallmark (1938-1984) and goldsmith's mark of Miguel da Silva Andrade (1942-1975) 5x5 cm 19.3 g VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (século XV a 1887)". Lisbon: IN-CM, 1996, nos. 98 and 2854