I was afraid that you were going to ask for a model designation, so I went looking in advance. Unfortunately I have been unable to find either a model or horsepower designation. I was able to find that there were at least two models designated by engine displacement. The larger used a 12 liter aircraft engine sleeved down 6000 cc, while the smaller used a 600 cc, 2 cylinder boxer engine. Looking at the puzzle picture the former appears too large to fit, while the latter seems a bit small for the chassis. In the absence of any other evidence, I will say that this is a 600 cc LuWe circa 1923.