As I don't know where this cup come from I post it in this section. First, I was thinking it could be Portuguese but...
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Silver hallmarks:
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Silversmith hallmark and what I consider to be the "french swan":
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(admin photo edit - images too large - link only - see Posting Requirements )
Searching on the forum I found the topic bellow about Julien Derriey:
http://www.925-1000.com/forum/viewtopic.php?t=35917
What I can not at all identify are the other hallmarks.
Thanks for your help!
Best regards,
Don SMoka