This posting is an attempt at clarifying some of the numbers that often appear on various Aces of Spades among the many brands issued by NYCC. I found this information in a couple of mint decks that still contained the accompanying slips of paper inserted into their respective boxes. This represented one of the ways in which NYCC tried to improve their customer service and guarantee satisfaction.
The first two photographs show the front and back of one of these slips that indicate which sorter at the factory assembled the deck and placed it in it's OB. You will note the numbers "9" on the front and the stamped number "84" on the back. This slip was inserted into a NYCC deck with their celebrated Angel back and a tax stamp dated 1899 so this was the practice at around that time.
The third photograph shows a slip of paper that was inserted into a deck of Triton brand playing cards. Although the tax stamp for this deck is intact, the red cancellation is indistinct and so I cannot identify the date which would tell us when NYCC instituted this new practice of identifying which sorter handled any given deck.
The fourth picture shows the Ace of Spades where we can see the stamped numbers "5 8 4" in the lower right hand corner representing the new way of identifying which sorter handled this deck. Unfortunately, I am unable to determine the significance, if any, of the printed number "713" at the base of this card.
The fifth picture shows the wonderful back design for this deck entitled "Flower Dance" which shows a performer adorned in what appears to be colorful Japanese attire compete with handfuls, and a hat full, of flowers. If anyone can determine when this design was issued then we can determine the circa date when NYCC changed their method of identifying which sorter handled which deck and what measures would have been called for when the incorrect deck was returned to them for replacement.