Unknown Mark on Silver Goblet

[AGHEAD]

I have a medium large silver goblet with the mark below. Mark next to the 13 is so small I tried everything to get a good picture but no luck. Mark is also a bit rubbed. Any ideas?

[huszas76]

Hello!
I think it's from Schwabisch Gmünd.
Regards!
Krisztián

[AGHEAD]

Thanks for the quick response. A second set of eyes is very helpful. I'd been looking at the mark from left to right, looks like a two headed snake. Now that you have posted, I see the unicorn when viewing from right to left. Thanks again.