In the left upper corner there are five (5) numbers. The "Gate" number (First two digits) and the "Base" number (last three digits) what do these numbers mean?

All of the Lynch Road tags have a "1" for the third digit or the first number of the "Base" number. All of the Base numbers are either: 10X, 11X, 12X, 13X, 14X and 15X. I have not seen, to this point, any higher numbers than 15X (no 16X, etc.,). The majority of the A12 tags that I have see have either 11X or 15X for the "Base" number.

There are three A12 tags shown in attachments (by me) in this thread HERE that have a sideways "X" inspectors mark that the "Base" number is 15X. The V.I.N's and lower right sequence numbers, of these three tags, are not close at all nor are the numbers to the right of the gate and base numbers, the they have the same inspectors "X" on them. He apparently worked quite a bit in '69 .

I don't know if this observation has ANY value at all, I just thought I'd throw it in the pot.