HI Wrongalot,
I 'll try and give you a hand here. I happened upon this auction :
http://coins.ha.com/common/view_ite...=5550&src=pr
There is a little information there, at least about this particular coin. I guess from the statement that there are 15-25 known would indicate that these are very rare indeed. I have heard before about possible "experimental strikes" in 1964 of the new SMS dies, but don't know where ,and can't remember much about it right now. I will keep searching for information since I am interested in this also. Hope that helps a little anyway .
I 'll try and give you a hand here. I happened upon this auction :
http://coins.ha.com/common/view_ite...=5550&src=pr
There is a little information there, at least about this particular coin. I guess from the statement that there are 15-25 known would indicate that these are very rare indeed. I have heard before about possible "experimental strikes" in 1964 of the new SMS dies, but don't know where ,and can't remember much about it right now. I will keep searching for information since I am interested in this also. Hope that helps a little anyway .

















