A quick interweb trawl leads me believe that Renault were experimenting with this design in 1917. I thought it may have been based on the mechanics of the Renault tank, but no. It seems that Renault took many clues from an American machine already in existence. Can not date the photo. The vehicles in the background look WW1ish as do the uniforms. It could, however, be post war.... BUT WHO CARES! This is great. Use it! Mass production for the agricultural market began in 1920.