Tested and fully working.
The Praktica LLC was made from 1969 to 1975 by Pentacon, the East German super "combinate" which had gathered most of former East Germany's camera production in one company. It was the first SLR for interchangeable lenses with electrical transfer of the lens's aperture value to the camera body. Therefore it had three contact plates in the lens mount. Thus it was possible to use TTL-metering by means of a match-needle meter instrument visible thru the finder at maximum lens aperture.