Hello --New Member-----What are the correct tire pressures for Beaver Tractor

[Beaversdb]

Beaver tractor with AKN Engine do not know year----appox 1960 or so.
Please advise correct tire pressures.
Front tires Good Year 4.80/8.00-8 all weather
Rear tires Firestone Champion Ground Grip Tractor 6-12
No PSI info on tires.

Thanks!