OK, enough of my teasing.
I didn't know what it was till it showed up either. Jon got it right; it's a Hoyer 5042 (made 50 yrs ago in Germany). The Hoyer company was around forever and made a lot of quality instruments back in the day, including many copies (not cheap either) of American brands like Gibson, Rickenbacker, even Alembic, plus their own creations like this one. The tuners look to be Schaller (German of course), the body is carved out of 2 pieces of wood, and the set neck is the most odd blend of zillions of laminates.
I plugged it in when it first showed up and it sounds like an old Rickenbacker 4001 (not a bad thing). It is also the only electric bass I have played that weighs more than a Peavey T40! However, it does balance well.
The cosmetic work is done, now on to checking out the electronic,s and then the set up. I still don't know what the 'Balance' knob does.
There is so little actual info about these on the internet.