Hi Michael I've read through your post and, in particular, saw that the 9th string is a B, levered up to D. Since your guitar is a 12 string it's probably a Universal tuning; that 9th string change is there to replicate the 9th on an "E9th 10 string jobby
The alternative to a uni. is an "extended E9th" - the 10 string version with a couple of extras.
I have heard of Russ-Ler, they go back quite a time but are not to be confused with Russler which was a new venture by Russ Hicks and Randy Weideman around 2011. The Rus-Ler was produced in USA during (I think) the 1970's. Norm Hamlet played one.



