Stamps of Portuguese Congo, 500r denom
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postage
1898 1898 issue (no wmk info) (no perf info)
| - | 500r | blk & red | King Carlos | — | — |
1911 1911b issue ovpted
| - | 500r | blk & red | ovpt, King Carlos | — | — |
1914 1914b issue ovpted
| - | 500r | blk & red | on 500r-blk&red (2) | — | — |
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