Just looked and found some additional pictures in my collection and can offer the following
See the size and some coding on the examples I have pictures of and size of the font appears in two different sizes - one style covers two bands while the other covers about three.
In another part of the printing it appears to be coding - sometimes smaller than the size of tire printing and sometimes two different sizes in the same coding. Not enough examples at this point for me to make out the meaning of the coding at this point
Do have three examples with the taller tire size printing with a "L7CU" preceding the tire size
Wish it was more consistent and they were all the same. Would make it much easier.