Yep...that is an original 1918 belt loader. I was told that the smaller box was done for the Canadians and I repaired one for a customer and made a repro for myself. I've only seen 2-of these smaller box's but several of the Jacobsen loaders,an American Co. Believe there were 6-Co's that had contracts to make the 1918 loaders. Last ones made were in 1943,as that has been the latest date I've seen.