Stamps of Rio de Oro, COLONIA DE RIO DE ORO inscription
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postage
1905, Dec King Alfonso XIII unwmk (no perf info) (16 stamps)
| - | 1c | blgrn | King Alfonso XIII | — | — | |
| - | 2c | cl | King Alfonso XIII | — | — | |
| - | 3c | brnzgrn | King Alfonso XIII | — | — | |
| - | 4c | dkbrn | King Alfonso XIII | — | — | |
| - | 5c | orgred | King Alfonso XIII | — | — | |
| - | 10c | graybrn | King Alfonso XIII | — | — | |
| - | 15c | redbrn | King Alfonso XIII | — | — | |
| - | 25c | dkbl | King Alfonso XIII | — | — | |
| - | 50c | dkgrn | King Alfonso XIII | — | — | |
| - | 75c | dkvio | King Alfonso XIII | — | — | |
| - | 1p | orgbrn | King Alfonso XIII | — | — | |
| - | 2p | buff | King Alfonso XIII | — | — | |
| - | 3p | dlvio | King Alfonso XIII | — | — | |
| - | 4p | blgrn | King Alfonso XIII | — | — | |
| - | 5p | dlbl | King Alfonso XIII | — | — | |
| - | 10p | rose | King Alfonso XIII | — | — |
1906 ovpted
| - | 15c on 25c | dkbl | King Alfonso XIII | — | — |
1907 ovpted
| - | 10c on 50c | dkgrn | King Alfonso XIII | — | — | |
| - | 10c on 75c | dkvio | King Alfonso XIII | — | — |
1907 1907 issue King Alfonso XIII (16 stamps)
| - | 1c | cl | King Alfonso XIII | — | — | |
| - | 2c | blk | King Alfonso XIII | — | — | |
| - | 3c | dkbrn | King Alfonso XIII | — | — | |
| - | 4c | red | King Alfonso XIII | — | — | |
| - | 5c | blkbrn | King Alfonso XIII | — | — | |
| - | 10c | choc | King Alfonso XIII | — | — | |
| - | 15c | dkbl | King Alfonso XIII | — | — | |
| - | 25c | dpgrn | King Alfonso XIII | — | — | |
| - | 50c | blkvio | King Alfonso XIII | — | — | |
| - | 75c | orgbrn | King Alfonso XIII | — | — | |
| - | 1p | org | King Alfonso XIII | — | — | |
| - | 2p | dlvio | King Alfonso XIII | — | — | |
| - | 3p | blgrn | King Alfonso XIII | — | — | |
| - | 4p | dkbl | King Alfonso XIII | — | — | |
| - | 5p | red | King Alfonso XIII | — | — | |
| - | 10p | grn | King Alfonso XIII | — | — |
1908 ovpted
| - | 2c on 2p | buff | King Alfonso XIII | — | — |
1908 ovpted
| - | 10c on 50c | blkvio | King Alfonso XIII | — | — |
1908 1908 provisional issue ovpted King Alfonso XIII (5 stamps)
| - | 15c on 25c | dpgrn | King Alfonso XIII | — | — | |
| - | 15c on 1p | org | King Alfonso XIII | — | — | |
| - | 15c on 1p | org | King Alfonso XIII | — | — | |
| - | 15c on 1p | org | King Alfonso XIII | — | — | |
| - | 15c on 75c | orgbrn | King Alfonso XIII | — | — |
1909 King Alfonso XIII (8 stamps)
| - | 1c | King Alfonso XIII | — | — | ||
| - | 2c | King Alfonso XIII | — | — | ||
| - | 5c | King Alfonso XIII | — | — | ||
| - | 10c | King Alfonso XIII | — | — | ||
| - | 15c | King Alfonso XIII | — | — | ||
| X | 20c | King Alfonso XIII | — | — | ||
| - | 25c | King Alfonso XIII | — | — | ||
| X | 30c | King Alfonso XIII | — | — |
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