Oooh, I have one. got it back in the 1970's. I was going through my collection recently, and took pictures of everything (460mb). I would love to submit the file for opinions. Anyway, when I did, recently, I was told the 55 double die didn't look right, and may have the word "copy" on the reverse. Obviously, he never saw one, before. I've checked around and I think it is ok. What do you think? In the future I plan to have it authenticated, if I win the Lotto. Please see the enclosed high resolution image.
When you show the reverse, make sure the obverse is lined up perfectly. The reverse should not line up perfectly.
It's called a doubled die....hmmm I think I've heard that somewhere. Any idea where I heard this Paddy?