Geoff Boxall tested a Parkerized Model 50 in the Jan 1985 issue of Airgunner. Strangely, it is based on the classic Model 50 action with 3 ball trigger, yet has an extended underlever like the Typ 01. It also has the winged front sight and the fairly familiar plastic rear sight of the time. It appears to be a bit of a Frankenstein job.
Geoffs piece contains inaccuracies regarding 50/ 50 Typ 01 similarities but Gerald Cardew provides very good input.