Yes there were! In 1972 Sunoco gave away NFL football stamps with an album. As a matter of fact, they put out an update set of stamps as well. It was a rather large set as each team had 24 stamps in the regular issue (22 starters plus the kicker and punter). There were numerous stamps that corresponded with that year's 1972 RCs and even a bunch that predated their RCs.....Jack Ham's 1973 Topps RC for example.
The stamps came in little booklets of 9 stamsp each so getting a complete set of 624 must have been a tough task not to mention getting all the updates as well!
Here is a checklist for the regular issue stamps.
Sometimes I think I spent way too much time on vintage football. But I make up for it by knowing almost nothing about cards from this Century! LMAO!!!