Keystone View Company
1918
German Soldier's Graves and Crude Monument for the Men Who Fell on the Eastern Battle Lines.

Stereoview
Internet - Original source ill-defined
Three different stereograph companies used this negative.
 

1. Underwood & Underwood, 1915-1916, Monument to fallen German soldiers made from un-exploded enemies shell.
   
2. Neue Photographische Gesellschaft (NPG), 1915-1916, Krieg 1914-15.: Denkmal für gefallene Deutsche Jäger aug "Ausblasern" zusammengestellt.
   
3. Keystone View Company, 1918, German Soldier's Graves and Crude Monument for the Men Who Fell on the Eastern Battle Lines.

I'm indebted to Ralph Reiley for this information (5 May 2021)
 
LL/111144