Big D I'll throw a wrench or twist into to this thread............have you noticed that those same letters/characters X, W, R, & B also show up stamped into Fender Tags as "inspector's" or "inspection" marks?
LOL, no need to wrench or twist on this one at all. Every digit or letter appears as an inspectors stamp at 1969 Lynch Road except the following: 5,6,9,I,M,Q,V, and Y. I assure you there is no relation between them.
D
Big D what do you make of these? Tire info on the left so what's the need for SHX or SXX or SHY or.........???