Sudan. 1946. Air Mail envelope addressed to New York bearing SG 43, 15m blue and chestnut (strip of four) tied by Khartoum date stamp '10th July 46' with hand-stamp 'By Air Mail' and framed instructional 'Insufficiently Paid For/ Despatch By Air Mail' on face. Scarce Air Mail cachet later than listed by Proud from (1.9.40) - (30.10.41).