From WILL - Classics of the Phonograph -

Recordings of early music by Archiv Produktion

One of the pioneers in the recording of early music was the Deutsche Grammophon company, which established the subsidiary label, Archiv Produktion, in 1948. These silver-labeled records attempted to present early music in the most authentic form possible. The records were accompanied with the most detailed documentation I have ever seen on any recordings. The first discs, in 1948, were of Bach organ music played by Helmut Walcha, a star of the label for 30 years.