I am the original owner of a 1964 "The Duke" team signature football. My father bought it for me at a charity auction for something like $35 if memory serves. That would be about $265 in today's dollars.
It looks to have been signed during the '64 preseason since one signature (Dwain Beane) was a '64 draftee I don't believe made the team. Being 9 years old at the time, I admit to kicking it around the yard a couple of times. Gasp! One side is faded a bit but all the signatures are legible.
Lombardi and all of the HOF players from that team are represented except Willie Davis.
McGee, Jerry Kramer, Caffey, Tom Brown and Skoronski are missing.
Hornung, oddly enough, signed it just "Hornung" assuming the clubhouse boy didn't sign for him.
Otherwise, all of the players listed on the '64 roster at packers.com are present along with 6 coaches.