Like the Primotar 180 and the Telemegor 250, the Telemegor 5.5/400 was a lens that had been designed for earlier medium format cameras (Primarflex, Meister Korelle, ...). These lenses were all in the "silver" finish. When the Praktisix was anounced, Meyer had a black Telemegor 5.5/400 ready. It was only made in the early years.