I believe this card is the only one of its kind. I know TOPPS has done this with other CELLO PACKS but nowhere can you find one with Joe Montana on top of packaging upside down.
The card itself looks mint and PERFECTLY CENTERED. It's rare enough to find Hall of Fame players on top of cello packs; let alone upside down. Honestly, i can't find anything wrong with the cello pack. It was completely sealed and in-tack before grading.
I personally believe PSA gave it a grade of 7 because the card is upside down. You can see the photos and judge for yourself. Because there are no other Montana rookie cello packs exist with him on top upside down. Thanks for looking and best of luck! The item "1981 TOPPS Football Cello Pack JOE MONTANA SEALED ROOKIE CARD 1/1 ERROR" is in sale since Saturday, March 24, 2018.This item is in the category "Sports Mem, Cards & Fan Shop\Sports Trading Cards\Football Cards". The seller is "kingblackbolt09" and is located in San Leandro, California. This item can be shipped to United States.