This lot is for 2 Polymerbit Ethereum notes, the Test and Final (#22) release of the 10 mETH note.
These are both error notes. The small text down the left side of the front reads “Bitcoin document” instead of “Ethereum Document”.
Approximately 30 of the test notes were released before the error was discovered. I believe 50 of the final note were printed with the error before it was discovered.