Stamps of China - Japanese occupation of North China, dpbl color
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postage
1942 1942e issue ovpted on stamp of China - martyrs (1932) wmk. yu p. 14
| - | 1c on 2c | dpbl | Sung Chiaojen | — | — |
1942 1942f issue ovpted on stamp of China - martyrs (1932) Hong Kong print unwmk (no perf info)
| - | 1c on 2c | dpbl | Sung Chiaojen | — | — |
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