cover 10Kr. deep yellow with 1870 7Kr. dull ultramarine on 1874 registered envelope to Warsaw, lightly cancelled by single-ring "SCHWEINFURT 6/MAR." d.s. with "CHARGÉ" h.s. and arrival c.d.s. (24/2) adjacent. A fine and rare franking to an unusual destination. Signed Brettl. M.29Yb + 25Ya. Photo