This model is quite rare, having owned and worked with more than fifties of tape recorders (from 2 to 24 tracks)
this is the only one I've met
I put it under the brand BRAUN, but in truth it is a CSA: http://www.asc6000.de/index.htm
the two brands are related and if we find the particular look of
"Braun Design Dieter Rams"
AS 6000 range was produced from 1977 to 1990.
Often compared to the Revox is equivalent (in my opinion) of PR99,
on the other hand it has three speeds:
9.5, 19 and 38 cm per second (as Revox A700).
6002 AS are two tracks, 6004 are 4 tracks
bondage tape transport is very well done
(Better in my opinion a Revox).
on the other hand I do not like the counter on my model that measures the length
band and not the time, this time the locator of PR99 MK2 is better!