Cover of internal registered letter with phil. attachment for the sum to 100 francs, sent from from abroad, due to damage at the opening of cover phil. attachment repacked in a new cover with stamps of USSR for sending of the USSR. Sent from Moscow to Taganrog on September 15, 1926. Received on September 17, 1926. Import duty paid by stamp РЕ 6 type 1а (without "И" in word "ФИЛАТЕЛИИ"). Very rare. Damaged corner of cover.