Lot 50495 – German States, Bavaria – 1849: 1 kreuzer on oblong

German States, Bavaria – 1849: 1 kreuzer on oblong strip showing two impressions in black, with copious and colourful handwritten notations relating to exposure time and colouring. A unique and articulate documentation of the Sperati experimental production process, with nothing similar found in the B.P.A. or “Ultimate” collections.