Bavaria, 1920, 20pf on 3pf brown on grayish whie paper, Type II Overprint, Bottom Margin Pair. In combination with 1919, 20pf + 5pf dark blue (Mi. 173A) on registered cover to Leipzig, canceled by "Erlangen, 22 Feb, 20" cds's, registry etiquette and receiving backstamp, Very Fine, a very scarce on cover usage; with 2008 A.P.S. certificate. Michel No. 177IIxa; €1,100 single on cover ($1,507)  Estimate $300 - 400. $0 (Image)