Super Wild Guess, There is a coin dealer in Florida whose name is pronounced that way, not spelled that way. He has a face book page, and, his young daughter is a grader for NGC. I do know that he also deals with currency, so, I'll ask him and get back to you.
I'm pretty sure this Z-man guy is probably someone who likes to mark $2s so he can be reminded of where they are next. I remember I got this one bill that had a dwarf stamp on it.
Of course, there is a much more efficient way to do this today. It's called "Where's George".
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