Question... why is this a "Monero Note Two" if it's a 1 XMR note technically and a serial #61?
Yup to confirm andolika is partly correct.
The full answer is the following. Mystery notes are a sub brand of Polymerbit. They are a product that is experimental, using for the first time a technology or design (usually both) that revolutionises what we can offer.
The denomination or even type of cryptocurrency can differ.
Mystery two was the second note in this line.