TIRNOVA: 1845, official cover to Istanbul with manuscript dispatch notation „Tirnovo“, arabic blue „Tahrirat-i Mühimme“ for official mail and fine strike of blue „AN CANIB POSTA-I DERALIYE 257“ applied upon arrival. Very fine and scarce. Ex Schäfer and Heimbüchler. Signed Nakri and opinion Todd AIEP.
