1957 REGISTERED AIR MAIL LONDON TO ILLINOIS, USA FINE 2.6 CASTLE USAGE. Fine QEII 6d purple 'OVERSEAS REGISTERED LETTER' London to Springfield, 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. (Ref 109596).
