Jose, the right and left handles shown by Gav are a matched set--the right one has been cleaned.
I see what he is talking about--the patina on the left example sure does have a "coppery" tone.
Again, it's going to be quite hard to definitively determine the metal just from the patina (not to mention the fact we're all only looking a pictures on a computer monitor).
However, having said that (and having handled hundreds of examples from the region) I would say that the patina in the original example looks more like a brass alloy than a silver alloy.
