Really really rare cap. This is the brand the Pros wore. If there was a number on it then it has worn off. This is an earlier cap prob 1950s or 1960s due to the snapback but not sure at all. It does have a strong vintage smell to it as it was uncovered with a slew of other Packers stuff that has been stored away for many many years. Please view all photos. Cap will need a good cleaning but its just too good to throw away. I clean out estates and find a ton of stuff. Please see my other listings for a wide variety of wonderful items.