cover 1879 (14 April) envelope (opened out for display) registered to Prague bearing (on front) first printing 7n. mauve and (on reverse) 1876-81 transitional period 10n. blue, both cancelled by "CETINJE" c.d.s. and showing script type "Chargé" h.s. adjacent; the 7n. and address are faded, though a rare mixed franking

细节
cover 1879 (14 April) envelope (opened out for display) registered to Prague bearing (on front) first printing 7n. mauve and (on reverse) 1876-81 transitional period 10n. blue, both cancelled by "CETINJE" c.d.s. and showing script type "Chargé" h.s. adjacent; the 7n. and address are faded, though a rare mixed franking