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... is not really a breed (as in with a recognised standard). It was a regional variety that was bread for meat. It got lost in the 1920/30s. Today there is a local club, that tries to bring it back via cross-breeding.
Maybe the European list would have been a better source (at the moment there is a "This Account has been suspended"-notice). A good source may also be the "Liste alter einheimischer Geflügelrassen in Deutschland" (also includes ducks, geese and turkey) that defines "old native breeds" (=alte einheimische Rassen; known and bread in Germany before 1930, with the original colours)