Not that kind of plunger ... a DIVER

From 1975; $2 face, $6 catalog. Unfortunately, this one has a thin that I assume was caused by another stamp sticking to the front of it?

Annotated close-up of the reverse:

I
with wish the face had been intact and the thin on the gum side!
Sometimes you're the bug, sometimes you're the windshield...
KirkS