Small antique repousse box, tiny hard to read markings, ID help

[raibos]

Trying to ID maker on an antique sterling box, detailed repousse lid with roses, gold wash interior, tiny marks, one on side of lid, one underneath. Looks possibly like an R? Not sure if it's American, doesn't look like English marks, any help appreciated.

[AG2012]

Hi,
The mark on the left is not very clear, so relying on its shape; a rectangle with 4 cut corners is seen in Portuguese marks (Porto Assay Office ).
http://www.925-1000.com/foreign_marks3.html
Most of other countries can be excluded as far as I can tell. Not British marks for sure.
Regards

[raibos]

I tried to clean up the smaller mark with a toothpick, it is a square with clipped corners, possibly a bird's head with 835 beneath?

[AG2012]

Hello again,
Yes,it`s Porto assay office after 1938.
Google for ``Porto silver mark``(Images for Porto silver mark)
Regards

[raibos]

Thank you for the ID. If anyone knows a resource for Portuguese maker's marks . . .

[Aguest]

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.

[blakstone]

According to the reference listed above, this mark was used 1907-1931 by Inocêncio Recarei Leite de Andrade of Porto and 1931-1964 by his successor, I. Recarei, Filho.

Hope this helps!

Ref: Manuel Goncalves Vidal & Fernando Moitinho de Almeida, Marcas de Contraste e Ourives Portugueses, v. II 1887-1993, 4th ed. (Lisbon: Impresa Nacional - Casa da Moeda, 1997), p. 201, mark 1933.

[raibos]

Wow, thank you so much. I don't have access to the reference material so to say this helps would be quite an understatement.