Grade just posted on this -- AU55. In to the Prime Number Set it goes along with a few others! 8 coins short of being complete either 1601-1973 or 1721-2017. My plan is the former, but it'll be a bit tougher than the latter.
Coincidentally, I just discovered this set (your set) earlier today perusing threads on the PCGS site. What a neat idea and a challenge to complete.