Be careful of fake Casascius coins. They are really are getting good at it. Its just a matter of time before they will nail it to perfection.
There is one listed on ebay that is a pretty good forgery
https://www.ebay.com/itm/2011-Casascius-Physical-Bitcoin-No-Reserve/202279178717?hash=item2f18c751dd:g:y0IAAOSwPoZaw6bdThe FORGERY is on the LEFT and the real one on the RIGHT
Notice the N is too wide on the Forgery!
Different Font used too. Looks like the forgery is
THINNER than the real one!
The lines too deep or more defined on the Forgery!
The background pattern is different on the Forgery!