cover 6Kr. red-brown vertical strip of three with large margins, on neat 1857 envelope to Mühlhausen, cancelled by open cogwheel "B.P." and showing half circle "K. BAYER. BAHNPOST/AUGSBURG 3 6" d.s. and two transit h.s. in red adjacent. Very fine and attractive. Signed Pfenninger. M.4 II. Sem D.M. 600+. Photo