TB, I carefully searched the site you linked above, I couldn't find anything even remotely similar to this badge. They only sell novelty items, buttons, for like under $10, but this badge is huge in comparison, and it's sterling silver.
I found info on the web searches I did that indicated that there are a lot of fakes, replicas out there, so I'm trying to figure out if mine is real or not. If you were holding it in your hand, you can feel the weight of it, it's very well made, and solid sterling silver (I believe)
I usually do a fair amount of Google searching, like you suggested :) but that giant tooth sorta caught me off guard. I didn't do any searches until after it was posted that it was a shark tooth.
So, any opinions on this badge? Reproduction? Fake? Authentic? It certainly appears to have the genuine 'patina' of an antique badge.