TWO AIRMAIL USAGES UK TO MEXICO 1950 AND 1951 PAYING 1s RATE TOTALLY DIFFERENT FRANKINGS. 1950 airmail envelope London to Monterrey, Mexico with KGVI ½d pale green (SG485) 2d pale orange (SG488) x two and 2½d light ultramarine (SG489) x three paying the 1s rate, cancelled 'LONDON' 8 JNE 1950, various handstamps and date stamps suggesting non-delivery. Also a second airmail envelope from Plymouth to Mexico paying same 1s rate with a single 1s bistre-brown (SG475), Plymouth 'PAQUEBOT/POSTED AT SEA' date stamp 13 SEP 1951. (2 items). (Ref 145477).
