The date of issue on my passport is one day after that of my N-550.
Hope i didn't exceed the speed limit driving from the naturaliation ceremony to the passport agency
Oh, and of course international travel a few days later and scheduled appointment.
I would bet that passport agencies will stop being this useful. From what i understand, when starting in 2019 we will get polcycarbonate, they will not print the passport locally anymore but need to ship them from those central print center(s?) they already use for the passport cards. More security theater.