1948 CHAN A 59, BLOCK OF 3 MNH, NG OVERPRINT ERROR
China's third airmail issue of 1932-1937
This stamp during the hostilities between China and Japan was printed in Hong Kong, from 1940 on watermarked and unwatermarked paper.
From 1932-1937 the printing was done in PEKING, perforated gauge 14 while Hong Kong issue are perforated gauge 12 to 13.Peking gum is yellow, thick and bright.Hong Kong is white, thin and dull.Also to make the difference it is a secret mark on the first chinese caracter after the denomination on the bottom .
To see the difference I recommend www.michaelrogersinc.com/articles/chinasairmail.html
Excellent site to keep as reference.
This vertical block with overprint error, is HONG KONG PRINTING.
See INTERASIA AUCTION SALE 23.
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