We have acquired a new wheel! I think we picked this one up in Hobbs, New Mexico. It measures 6.25 inches across and has a 1984 copyright date.
This wheel belonged to Alex Stathakos of Dallas, Texas. I decided to look him up. I think I found him! He passed away last year, if this is the same guy. Here's the obituary:
You're going to have to figure out this dial yourself.