Found this at a Saturday dig at the Half Price Books mothership store. Led Zeppelin IV. This is not an original pressing. It is a 1975 record club edition. Close enough to 1971 for me. It is in perfect condition.
I first heard this album in high school on cassette. There was no consensus among my friends what this album was called. Some called it "signs" after the markings on the actual cassette. Others called it "Runes." Eventually I think the consensus among Zeppelin fans was to call it "IV" which makes the most sense.