One of the others who worked at that stereo store (still a great friend) had a '66 Fairlane at the same time and one cold night, he went out to warm it up before he drove home. He walked out of the store and returned a minute later, saying that he had locked the door and couldn't get in, so I said "Let's see if my key works". It did, like it came with the car.
Another job I have had was as a boat mechanic and lots of them used Pertronix or PrestoLite as OEM and generally, only the older guys know how to adjust the points these days. A friend has an '89 Carver with two GM big block engines and his distributors are OEM, so they have points. I needed to check or replace the points and couldn't find my feeler gauge, so I decided to find something that would be close to the usual gap- all I could find quickly was a guitar pick that's .73mm thick, which is just under .029". I used my meter to check/set the dwell and we were off.