Having all sorts of trouble with FTP on Linda's crappy BigPong ADSL, but there should eventually be four piccies of this 1999 50¢ she found. The closeup is there already at least, and others are trying to upload as we speak:
http://fulvio55.altervista.org/150125.Coin50cLinda/
At first I thought it might have been PMD, purely based on the huge number of war wounds it has on both sides, but I can't really see how this would have occurred. Then again, I also can't think how it happened at all. Doesn't look like a break, as such, unless its both a break and a fill in the same spot, which seems unlikely.
I'm guessing Nancy might have an answer though. ;)
A nice error even if do say so myself.
Without having the coin in my hand, I'd be pretty inclined to say PMD. To me it looks like it's taken a hard hit or 2, to the bottom of the L which knocked it out of kilter. Can't be sure though. :dontknow: