Originally published as a side-bar in my second article on the history of the Esterbrook Steel Pen Company in the 2023 no2 issue of The Pennant, publication of the Pen Collectors of America.

There are many kinds of ephemera still around from the old Esterbrook Steel Pen Company. Items like advertisements, pen cards, and salesman sample cards rarely come with dates on them. One way to get a rough idea of their dates is that they often include the company’s address. Esterbrook moved offices fairly often, and the address can sometimes give you a rough idea of the dating of the object. Here is a list of Esterbrook offices and known dates for that office.

Office Address	Earliest Confirmed Date
403 Arch St., Philadelphia	1860
16 N. 5th St., Philadelphia	1861
42 John St., New York City (NYC)	1865
51 John St., NYC	(late) 1866
75 John St., NYC	1867
49 Maiden Ln., NYC	1870
26 John St., NYC	1875 – have seen as late as 1912
95 or 99 John St. NYC	1910
97 John St., NYC	1920
277 W. Broadway, NYC	1940