Can anyone identify the mark?

1

Hello everyone,
My name is Duarte and I’m from Portugal.
I’ve got several forks and spoons with this mark. Is it silver 0.835? if so, what is it worth?

[2 new items added to shared album] Prata

thank you all for your attention

best regards
duarte

2

I think the maker/company is Ercuis, founded in 1867 in France. I have seen a similar symbol with 84 on electroplated pieces.