It's a little WW1 museum:
no pic but maybe it's on this site somewhere
http://www.ww1.org/index.html
article from 2000.
https://archive.seattletimes.com/archive/?date=20000829&slug=4039410
article from 1993.
https://archive.seattletimes.com/archive/?date=19931007&slug=1724905
"But the climax of a visit is walking over to the howitzer, which Cole found in Zanesville, Ohio, and bought for $1,500. He has been able to trace its history to 1962, but nothing before that, so it's not known how it was captured or shipped to the United States."