cover 1897 (5 April) neat envelope (flap missing) registered to the European Danube Commission in Soulina, Roumania, bearing third printing 10n. blue perf. 11½ and 3n. green and 7n. rose perf. 10½, each tied by "CETINJE" c.d.s., red registration label applied over upper edge, (12.4) arrival backstamp. A pretty franking to a rare destination. Photo in colour