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Schneider 155mm C17S Howitzer, also known as Schneider 155m C mle 1917. The most common French howitzer of WW1. Also used by the American Expeditionary Force, and later adopted by the US Army in a slightly modified form (and re-designated M1917A1). It was still in service in WW2. More WW1 etc photos here: @N05/
