The label is used on a PDRY provisional aerogramme (not catalogued by Wiegand nor by H&G). Note the straight edges at the top and on the right side of the label. The aerogramme was postmarked in Mukalla on 11 December 1977 and mailed to England. Mr. L. (Lou) R. Dearlove was a longtime collector of Yemen and Aden material.
The image of the aerogramme is from p. 6 of the June 2002 issue of The Dhow.