Dear New gold, Are you talking about the perspex cased British sets, that slide apart, with the coins set in thick card? If so, the answer is I don't know, because none of them are official, and I get the feeling that the perpex cases were made at a later date. They do seem popular, but I have never been able to find a source of them. I also don't know about date availability either. In fact I've only ever seen 60's sets.