Persian Gulf. (Bahrain). 1950. Registered Air mail envelope written from the 'British Bank of Iran and Middle East' addressed to India bearing SG 57, 6a on 6p purple and SG 76, 4a on 4d ultramarine tied by oval 'Registered/ Bahrain rubber date stamp in violet with registered label and framed 'Registered' hand-stamp with Bombay receiver. Scarce registered hand-stamp. Superb.