Stamps of China - Shantung, issuer=China-issue=1940d Martyrs secret mark wmk-13c on-desc-id
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postage
1941 1941f issue ovpted on stamp of China - martyrs (1932) wmk. yu p. 14
| - | 13c | yelgrn | ovpt, Chu Chih-hsin | — | — |
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| - | 13c | yelgrn | ovpt, Chu Chih-hsin | — | — |