I know the prevailing concensus among the knowledgable is that my new old bass is a 20th century German shop bass and I'm fine with it, but the label does make for a minor mystery. The label seems to be authentic to the maker Franz Feilnreiter as well as the F.F. brand in the bass according to
http://www.bromptons.co/reference-li.../page-202.html
In any event, it sounds good to me.
Here's the pics...