I looked in Elliot's second Lefever book as well, and didn't find the photo you are looking for.
A. O. Zischang is mentioned on pg. 24 as the barrel shop superintendent for Nichols and Lefever Co, and again on pg.28, where there is a photo of a Nichols and Lefever 10 ga. shotgun he owned. This book also has a photo of men working in the Lefever Arms factory, but Zischang is not present. His name also does not appear on the photo of the chalk time-board.
I wish I could recall where else I saw a photo of him. It may have been in "The Story of Pope's Barrels", or James Grant's "Single Shot Rifles", or C.S. Landis' "Woodchucks and Woodchuck Rifles.
I did find this one in Tom Rowe's book on A. O. Zischang:
![[Linked Image from i.postimg.cc]](https://i.postimg.cc/PrhLxc19/Screenshot-2026-01-21-at-23-10-59-Blurb-Books.png)