I stand corrected. It's a 165-13 or 6.45-13. The tread looks like a bias-ply. You roll off that tread and good luck. It could have 17K on it. That would make it 45 years old. It doesn't look bad. I know my 73 had bias-ply tires when I picked it out on the lot and had them the radials put on before delivery.
Yep, those pictures definitely look like a bias ply.