Posted By:
Hal LewisJC and I like the way ramram thinks. 
It does, after all, fit in with the absence of any other Peck & Snyder materials ever again listing the Ann Street address.
Of course, this theory could be blown out of the water if the 1868 catalog in the Library of Congress lists the "Nassau Street" address.
But then again ... ALL of the cards are GREAT and none need to be "older" or "better" than the others.