Checking my recorded and not yet published instruments, I stumbled about the wonderful 1967 Beckerath, Hamm, Germany (III,39), a completely preserved high quality instrument of this time.
The instrument is a listed building and one of the few remaining unmodified Beckeraths
Christian Brembeck was fascinated by this instrument (Alpha version) and immediately recorded a beautiful Buxtehude work, which I did not want to withhold