HONG KONG 1938 SG156ca Mint $1 yellow-orange and green variety Short leg to R digital-edition On reverse superb black and

On reverse superb black and red 'First Postal Message by Aeroplane Post/ Remington Typewriter Company' advertisement from the London Office

lower left corner example

with another comparable strike at left

with type 5 surcharge in black from the first setting (fraction "¬Ω" only 5mm tall)

each with margins on three sides showing two plate numbers

HONG KONG 1938 SG156ca Mint $1 yellow-orange and green variety Short leg to R digital-edition On reverse superb black and1938 52 $1 yellow orange and green, chalk surfaced paper, horizontal pair, the left stamp variety Short leg to "R" (left pane, R3 1), fresh o. g. Very scarce. P223010612