Nickel Silver Cup

[Crossbay]

http://www.flickr.com/photos/15457811@N06/9766213963/

Hi. This cup i have has markings on the bottom. Looks like a S in a triangle. What looks like to be written underneath is "Nickel Silver" as well as "Trademark" written smaller. Underneath that is the numbers 375 (or it may be 875). I think its alpacca, but i am not sure.
Any help would be most appreciated.
Thank you

[dognose]

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