1957 REGISTERED AIR MAIL LONDON TO USA/2/6 CASTLE USAGE. Fine QEII 6d purple OVERSEAS REGISTERED LETTER London to Illinois, USA uprated with fine 2/6 Castle and 1/3d Wilding cancelled REGISTERED/PORTLAND ST date stamps 31 JLY 57, on reverse SPRINGFIELD/ILL date stamp AUG 2 1957. Good franking. (Ref 109596).
