Persian Gulf. (India Used In Persia). 1918. Censored envelope addressed to Scotland bearing India SG 170, 2a6p ultramarine tied by Abadan double ring '16th Mar 18' with adjacent Crown censor in red. The Abadan Postal Agency was opened in 1917-23 to service the mail from the works in the oil field and refinery on this small island of Shatt-el-Arab. Very fine and rare exhibition item.