My former father in law was on the team that developed and marketed Pringles for Procter & Gamble. I recall it was the late 60s early 70s. We had among the first batches of them in the test marketing program. It seemed so revolutionary at the time. Then to there weren't all the varieties of regular chips either.
When Bob's parents came they brought a case of them to us & we participated in one of the survey groups.
Well, going to try to sleep again.
I believe you still do not have as many flavours as we do with normal crisps (chips) unless it has changed dramatically since 1997.
The best I could find was cheese and onion and same BBQ or spicy flavour not beef or chicken, prawn cocktail or salt and vinegar etc.