If it is an Eisentraut (and that's a big "if"), then there's a good chance it's a Rainbow 'Traut, Those went out under the Eisentraut name but were a joint effort along with Albert and Ed Litton - a Rainbow 'Traut could have been built by one, the other, or maybe even both of them. Not a bad lineage. Albert and Ed also both made customs under their own names during the Rainbow era.

BTW, although Ed worked with Albert, he did not learn frame building from Albert - Ed learned from Bernie Mikkelson. I got this directly from Ed himself, so I'm pretty confident about my source.