This completely blew my mind so I did some quick "google-izeing" and found out quite a bit about this nickel. The very first thing I should get out of the way is that this nickel seems to be worth close to $400 to a collector. So is this person cursed? No. Lucky as all hell to find a nickel worth $400? Yes!
There is also a huge community around these amazing reliefs, full of artisans, collectors, history and culture. These carvings are extremely rich and diverse with roots going all the way back the 1750's. I also saw a few articles siting influence of Greek antiquity and secret society membership tokens. The object in question is commonly known as the Hobo Nickel, more specifically the "skull Indian and buffalo carcass" Hobo Nickel. Here are a few examples I thought were interesting.
Pretty cool right? :)
http://en.wikipedia.org/wiki/Hobo_nickel
https://www.google.com/search?q=hobo+nickel&safe=off&source=lnms&tbm=isch&sa=X&ei=wunKUc_3G8PC4APGt4CoCA&ved=0CAcQ_AUoAQ&biw=1771&bih=892