WWI Artillery or Mortar prism/sight? Any thoughts?

[ScottG]

   Not even sure if its US or British. So, I am hoping someone here may know what it is and its proper name/nomenclature, thanks for any assistance.  Scott

[Bodes]

Weldon's rangefinder (1900-1914)....I would say non-European as the distances are not in metric (meters).....Bodes

 

 

 

 

[ScottG]

1 hour ago, Bodes said:

Weldon's rangefinder (1900-1914)....I would say non-European as the distances are not in metric (meters).....Bodes

 

 

 

 

 

       Awesome and thanks for the info!   Scott