Stamps of China, PRC, 25 Aug 1955
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postage
1955, Aug 25 scientists (1955) unwmk p. 14
| X | 8f | olbrn | Chang Heng | |||
| X | 8f | blgrn | n2.Tsu Chung-chih | |||
| - | 8f | blk | n3.Chang Sui | |||
| X | 8f | n4.Li Shih-chen |
1 to 4 of 4
| X | 8f | olbrn | Chang Heng | |||
| X | 8f | blgrn | n2.Tsu Chung-chih | |||
| - | 8f | blk | n3.Chang Sui | |||
| X | 8f | n4.Li Shih-chen |