Can't be that much of a mystery. Looks like the bottom of the seat tube has a "Hans Ohrt" shop sticker on it?
Steven Johnson, Shiloh, IL
Interesting bike, especially the story about the seattube document. Indu minium must have been an outsourced alloy of Hiduminium :^) Kinda pretty , but not even my size, so no interest in the sale. Could this be true a nd this is a special bike? Oh well, not riding this evening... and it sh ows.