[daveg]

Thanks for the pic Ralph.

After further discussions with Greg and digging more info acquired.
Seems these are probably all spare tires removed by dealerships- Goodyear stores back in the day.

He thinks 1 came from a Chev dealer and 3 came from Goodyear stores.
He and I both really searched hard for this type of stuff starting early 80's.

One at least was replaced when the tires on car were replaced with radials.

Note 3 of the 4 have been driven on a few miles to slightly wear the nubs down.

Interested in the date of your F70X15
F70X15 was still in use in 1972 on Vettes.
The 14' version seems to have had a much narrower- shorter life.

Factory installed tires did not have tread tags.
Some had yellow ink stamps or crayon marks though.