This 200 mm lens is not the same as M42 200 mm Sonnar, the optical design is much similar to Prakticar 300 mm.
Its multi-coating is almost identical reddish colour to its 300 mm brother, this is a rather rare lens like 28/2.4 FL.
But I once saw a catalogue from Pentacon showing this lens on it, so it might not have been very rare hopefully.