Ha, I thought Bien sounded real familiar and went back to our previous thread here (
https://www.net54baseball.com/showth...=309276&page=2).
Fullgraff was a clerk for Bien in the 1890's, from the same source I found that gave us Fullgraff's membership in the New York Athletic Club (which seems to relate to t218 and T220, many of those portrayed he surely knew personally) and the Larchmont.
You found a source of them being on Sixth Avenue in NY from between at least 1898-1915.
This is clearly all the same person/firm at this point.