Posted in other thread too.
Look at it like this guys. You are making knives, putting them through layout, grinding, finishing, and finally lazering the model number and serial number on the knife. You are of course going to have cut more than you'd need "just in case". During all this, a couple knives get to final inspection and something just isn't "quite right" with them. This is the reason for the "backups". They pull out one of the extras and lay the model and serial number on the knife. The computer doing this has been doing consecutive numbers on the knives up to this point so WHY would you waste the time to go in and reprogram the computer to go back and lay the same number on a replacement knife so the serials come out perfect? I know, long winded but it seems pretty simple to me, no?