Postby Aguest » Tue May 22, 2018 10:21 am
I have been unable to find a translation of this book, it could be only available in the original language:
Marcas de Contrastes e ourives Portugueses
2 Vols
Published by Imprensa Nacional - Casa da Moeda 1996.
For Portuguese hallmarks, the makers mark might be listed therein.