Stuart, I found the card link fascinating! Though I have one small quibble--the cards were NOT released in the summer of 1969! I distinctly remember they were available in April, possibly toward the end. I was a Sophomore in high school, and it was very early spring. The box on the cards is not purple, but red--as clearly show in the link's illustrations.
Other than that, the history was an eye-opener! I had all those cards, multiple sets, actually, and I never noticed the obvious mistakes Gallant points out. Man, I wish I'd kept those sets, now...they'd be worth $$$!
Thanks for the link!
Rod