Invite received, and here I am. Wish I had something to add but there are so many factors that don't add up to any reasonable explanation. Summer Time tags but TT functionality. If only 30 were put together, it does seem as if your game (and maybe @pinaholic's) were quickly slapped together as a quick test in New York. They could have simply left out all the Bulbs for Match and not cared about the unit stepping with 10 point scores. But they certainly didn't waste the labor of making anything but the production version of the Backglass silk screens. OR could they be the same exact machine?
With short game times, 99,990 max scoring would still probably allow a reasonable test on location. Remember, ideal game time for 5 Balls per play was 2 Minutes, 30 seconds. And without the function of the 100,000 unit, add-time-score thresholds would simply repeat if you rolled it over. Which is true of most add-a-ball games except the ones typically developed for Italy.
But then, why, does the publicity photo feature an actual ST screened playfield with 50,000 point center hole scoring? Of course, it looks like all the changes are all in the same color so only one extra silk screen had to be made to produce a few samples.
I know when we were operating in Phoenix, every brand new game had to be "Approved" by the police before we could run it. Once they knew what the game actually was (by Title), then everyone could operate that title. I wonder if the opposite was true for a place like NY? They would know which games were REPLAY games by name and therefore could not be operated. This would necessitate have a different Name but then doesn't explain the TT playfield art or the Instruction cards contained in your game.