If they are big and red, they are WBCCI membership numbers. Do a search for WBCCI and numbers and you will find more than enough info in the historical information. If you want the numbers then you have to check with the WBCCI for availability and join the club. Lots of info here on the pros and cons. I will stay out of that one. You can call them, they will send an info package and let you know about the numbers.
Congrats on your
1960 TW and welcome to the forums. It's great to have you here.
Mike