Just wanted to see what more knowledgable people have to say about this error. (Pay no attention to the booger that sits next to the crack)
Nice one... I see that your signature says that you are a "Counterstamp Collector." Well, take a look at these coins. I know they probably aren't counterstamped, per se. They're probably counterMARKED. Probably by a vendor in Japan who did business with foreign sailors, or something like that. (1877 2 Sen coins) Have you ever come across Japanese coins like this?
No, I haven't seen these before. I'm not aware of many Japanese counterstamps but I don't collect many foreign issues. I have a good collection of Irish stamps and a few English and French, but stick mostly to U.S. issues. Bruce