From what I have read the markings on the sling represent a rack number of sorts or maybe a unit number or some other group identification. My Type 38 came with an original sling. The original is in pretty rough shape so I use a reproduction in an effort to preserver the original. Anyway, in an effort to learn I am curious if the markings on mine are just numbers or if they may have some other identifiable meaning? I have seen some common markings and numbers from 1 through 10 but I can't find all of these.