Always loved the “Sinclair” gas station sign with the brontosaurus when I was a kid.
I worked at a Sinclair in Cleveland in the 60s as a teen.
We really did do full service back then.
Most everybody paid with cash. I think we took credit cards but it was very uncommon.
Now that my nostalgia has been triggered I can remember the Richfield gas stations here in California. They would give out decals of an eagle. Kids would put the eagle decals on their bicycle seats. This was about 1948-50. Richfield later became part of ARCO.