Chest organ after G. Näser (Fraustadt 1734).
The original is a prosession-organ, preserved in the
Germanisches Nationalmuseum Neurnberg.
It has three stops:
Gedekt-fluit 8′, Gedekt-fluit 4′, Regaal 8′
Compass C-d”’, transposition 415/440
Windpressure 25 mm
Case made of cherry-wood with oilfinish and wax.

In the audio-file you hear the stops 8′ & 4′ together in 
“Erbarm dich mein, o Herre Gott”  –  Johann Sebastian Bach (BWV 721)