The tires were made in Chile - I used to have a set of these on a Chevy pickup in the US. They aren't as loud as a lot of MTs and def. not as loud as swampers. Again, though my max speed is about 100 km/hr with the 3B.
They measure just under 32 mounted and sitting on the vehicle - (30 psi front and now 35 in the back) they measure 31". I raised the pressure in the rears to 35psi because they were still getting warmer than the front ones. Not too warm, but warmer. I'll run them this way for a couple days and then may drop them down to 28 and 33.
Most people run them around here at 40 or 50 psi and so they are bald in the middle with plenty of edge tread left. That is somewhat unavoidable given that they are bias ply and narrow.
As far as the '60 goes, it was originally in Paraguay. It is all original except for the striping. It came to me with 15" wheels and 31x10.50s BFG ATs which are great until you get offroad here in the mountains - the rocks have TEETH!! Oh, and it had black fiberglass mud-guards which I removed immediately. I LIKE it dirty - less chance that it will get stolen