Yes, it is a Original System Aydt and I'd guess made by Bruno Anschütz. Otto probably peddled if from(copy & paste) http://en.wikipedia.org/wiki/Eichst%C3%A4tt (Eichstätt, Germany). Pull the pin in the forend and see what the stamps are on the underside of the tube which will be something like "7.6/46" "B.A." "serial number" & "data code". There may be an encircled large "A" over "B" on the top of the barrel for Bruno Anschütz. Neat that it has the case for the aperture. Usually the tube length is in interger mm. The stock looks to be typical Tyrolean.
Kind Regards,
Raimey
rse
