I bought these way back in the early 90's IIRC, from the estate sale of an old guy who lived near my grandparents. Even then, they were obviously far from being new. I've used some of them over the years, but mostly just kept them as my backup stash. Currently, there are a little less than 600 left. Anyone care to venture a guess as to how old they are? I honestly don't know, but I would guess maybe early 60's; but that's just a guess.
Cheers,
Brian
Cheers,
Brian