I had one of these years ago, but never found any info on it. Dick Bueschel was doing research on it for a very long time, and never came up with even a hint. I didn't have it very long, before I sold it, as it never did impress me. A collector in England has one, and there are a couple here in the states, but none of them that I know of, have any kind of markings, that would indicate a mfr.