If from the 70s/80s I doubt they are worth much of anything (just the fact that they were printing the stamps in the hundred millions, I think) but I stand to be corrected.
That may be a bit of an exaggeration for a country of 2 million (in 1980). Still, new12collector has a point. Many of the stamps produced in/for Panama during this time.
Do please share images of the stamps you have. I (and others here) collect Panama stamps actively.