Hi all, I'm just new on the forum but have been coin collecting for a very long time. My main reason for this post is because I received a $50 note with odd stamp markings on it. I have never seen these before and the seem to be sublimated in with the rest of the ink. it is as if if was printed like this. One is a circle with '33' inside it and on the other side is like a triangle with a euro, yuan and us dollar signs in it. If anyone could tell me what this is or why its there, would be much appreciated.

