Is 37mm or 47mm the proper deck gun for Tea?
New York, 1917. “Actors’ Fund Fair.” 5×7 glass negative, George Grantham Bain Collection, via Shorpy.
The Navy deck guns on loan look to be either Hotchkiss 1-pdr (37mm) or 3-pdr (47mm) breechloaders, which by 1917 were thoroughly obsolete. I’m about 99 percent sure its they are the smaller guns due to the shoulder braces.