[Ron Wood]

I do not think they are Nazi guns...my opinion is that they are Weimar era Freikorps flamethrower unit guns. There are several variants of the marking and, of course, a lot of fakes to do exactly what you suggest, sell mixmasters. For the ones that I think might be legitimate I believe they were from the flammenwerfer platoon of the Freikorps "Minenwerfer Heuschkel" detachment. The sleeve badge of the detachment featured a skull and crossbones. It is my thought that the guns carried by the flamethrower platoon were marked with a "lazy S" surmounting the skull and crossbones, the lazy S representing the pattern of the sweep of the flamethrower.
Ron