Re "I was in 7th grade and living in England at the time (1969)":.
Seventh grade is an American classification isn't it? You would have been in Year 8 or in Middle School in the UK. Re "Unfortunately I don't appear to have kept any of them.": Yes, that is a bitch. I've discarded so much ephemera over the years that I now realize would be worth a small fortune if I'd only kept it in the attic: comic books; my Famous Five badge; my Golliwog badge; those underground magazines I chucked away . . . Alas, the benefits of hindsight.