cover 18Kr. vermilion (2 one just touched, both rather heavily gum toned), with 3Kr. carmine (cut-into at top) and 1Kr. pale yellow (Type I) horizontal pair (left stamp just cut-into at top) on neat 1864 (18 May) envelope from Würzburg to N. Jersey, U.S.A., cancelled by cogwheel "598", the pair also tied by "N.YORK BR. PKT/23 PAID" c.d.s. in red and showing origin c.d.s. and "AACHEN/PAID 23CTS" c.d.s. (19/5) in red adjacent. Rare and colourful. Signed Pfenninger. M.13a + 9b + 8 I. Photo