is a floating bridge design which Dieter Hopf developped and patented in the 1980 under the technical term f.v.t.s. (free vibrating top system). It is discontinued now but there must be a sufficient number of f.v.t.s. guitars alive because they are still offering appropriate string sets from Savarez and Hannabach.
A sound sample can be heard here
EDIT: What a coincidence. Siccas in Germany is is just recently offering a Hermann Hauser I spanish guitar model from 1920 with a floating bridge design in the bay!