Some more info:
These coins were made by forum member Hexadecibel back in 2013.
There is some info still around on the forum including one of his original posts here:
https://bitcointalk.org/index.php?topic=280340.0500 coin were minted, but some were discarded over quality and others were sold as DIY.
Approximately 200 coins were sold loaded with 1 BTC