First off I just joined this forum, so I'm not quite sure where to post this. My apologies if it's in the wrong spot..
My girlfriend and I found this coin here and think that it has some sort of error on the edges.. take a look:



The weird thing is that it's from 1968 but is in the best condition I've ever seen a nickel in. If you look close on the edge by where it says "Liberty - 1968" you can see the double ridge I mentioned earlier.
It is also much thicker than an ordinary nickel.. the '68 nickel is on the left compared to a regular 2011 nickel on the right in the 2nd picture.
Any ideas on what this is worth?