Five sided silver coin (what is it?)

I recently inherited a coin collection and I have been working to identify the coins.

I have been able to identify many of them with the aid of a guide from the library and looking on the internet...but there is one I haven't been able to find.

It is a five sided coin with a cross on one side. I uploaded some images to flickr here:

http://www.flickr.com/photos/39564612@N02/4468444084/
http://www.flickr.com/photos/39564612@N02/4468444284/

Any help or direction you can give me would be great.

Thank you.

 

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That coin looks coated in mercury, don't put it in your mouth, or anywhere else.

 

Weight is 6g...so I think this may just be a trinket that ended up in with the collection.