This is indeed a Bitcoin Specie (
official thread) and the normal coins were (and still are if you contact the creator,
NewLiberty) sold for a variable price quoted on
coldhardca.sh. However, this is the "
Whitepaper 5th anniversary"-edition of the Bitcoin Specie and only 100 were made (
source by creator) by hand. These were sold for the "
variable price * 2".
With the last eBay auction that I know off, one was sold for $56 according to
this post. So 0.5
BTC is pretty steep for this IMO, but who knows.