Serbia National Postal Museum
Japan - SC #96 - Used - 1899 - Japan167
GOLDEN VALLEY STAMP & COIN - 2525 Nevada Ave N, Minneapolis
Royal Mail demonetising all non-barcode Machin (+ other) stamps
Stamp Paper - A Case Study of Coconut Definitives
A Guide to the Japanese Post Office
Postscript! Japan's Stamp-Show - Press, media & spreading the word
Order returned - The Community
Chinese movement factory stamps
The Subversive World of 'Cinderella Stamps' - Atlas Obscura
1968 'ALL CHINA IS RED' 8f unissued stamp discussion and FAKES etc
Help Center For Japanese Stamps - Stamp Community Forum