I've just started learning about silver marks, so this one might be very obvious, but I rather double check through someone with more knowledge...
![Image](http://imageshack.com/scaled/800x600/856/e5rb.jpg)
![Image](http://imageshack.com/scaled/800x600/35/85xo.jpg)
I thought the "I S" was for "International Silver" but I don't recognize the company next to the IS, so I don't even know if the IS means what I think it does.
Thanks for the help!