It appears to be a nylon tire. Age doesn't affect nylon tires much. I install worn out nylon tires on storage trailers because don't blow out like radials. However, if the guy only has one of them, you may never find one to match it. We used 7.50x17 on our pickups back in the 1950's and 1960's. 8.25x17 were in the price books back then, but I'm not sure I ever actually saw one. I have a couple of old pickups with 17" wheels. Next time I put new tires on my 3500HD I plan on putting radial tubes in the old tires and use them on my old pickups.
