When the heads get assembled (computer, display, amp, speakers ), the serial number is assigned to the machine at that point. While we were waiting on parts they built over 60 heads and they don't necessarily grab them in numerical order when putting them on a cabinet. Once we get through the inventory of assembled heads, they will be closer to being in order but will never 100% reflect what number machine it was off the line. If you look at the attached photo you will see those closet to the camera are numbered in the 50s
A 'D' means there is some minor defect some place on the playfield that was identified during inspection or assembly. Odds are you would never spot them unless you were searching for it. My guess is most other companies would not even consider these things to be a defect. So far on the games that are noted with Ds I could not see the defect on my own and even when told where it was I still could not see it at first, only after looking at it from just the right angle would I see it. Regardless, these games are designated to be used in showrooms or as show games for distributors, not for customers.. I also believe distributors are being sent images/info of the issues first to be sure they are okay with it.
Games continue to ship, but certainly not as fast as any of us would like.
Monday morning I saw the names of at least five different distributors on pieces of paper taped to packaged up machines waiting for pickup. Later in the day I watched for a few minutes as a half dozen were being loaded into a FEDEX semi trunk for at least two different distributors (I know at least a couple were for Nitro, so one of those was likely transptr4u's game).
I was just in the factory a few minutes ago and I see a half dozen games at the loading dock, a couple have the name of an east coast distributor and at least one for a mitten distributor, did not notice per se how others are marked. I don't know all the ins and outs of the order games ship, but like it is when you put money down with the distributor, First in, First out I believe is a big driver of it. However, balanced with that is getting games to as many distributors as possible so they can have one in their showroom, or nearby on location or to take to shows.