Good question but I think they mean L to R like reading since I think when they talked about batch numbers for certain other things they'd say second or third digit and those times they clearly meant counting from the left.
But maybe they felt like switching things up this time, variety is the spice of life someone read there.
So yeah that is potentially vague. Taken as a number you might be inclined to go R to L but since these something have weird things like leading zeroes it's more like a word sort of and reading so L to...Show more →
It is not vague. The advisory clearly states:
EOS-1D X: If the sixth digit from the left of the serial number is 1, 2, 3, 4, 5, 6, or 7.