Hong Kong. (Airmail). 1936. Air Mail envelope addressed to Shanghai bearing SG 117, 1c brown (pair) and SG 119, 3c grey tied by 'hong Kong/Air Mail' double ring with boxed cachet 'By Courtesy Air Flight/Hong Kong China Japan/Royal Air Force/Feb 18th 1936' in violet with Imperial Post Office Shanghai arrival. Nice item paying the 5c rate between Hong Hong and Shanghai.