Stamps of Spain, 4 base month
1 to 50 of 510
postage
1855, Apr 1 wmk. loops imperf
| - | 2c | grn | Queen Isabella II | |||
| X | 4c | brnred | Queen Isabella II | |||
| X | 1r | grnbl | Queen Isabella II | |||
| X | 2r | brnvio | Queen Isabella II |
1856, Apr 11 unwmk
| - | 2c | blgrn | Queen Isabella II, imperf | 100 – 1,000 | 10.–100 | |
| X | 4c | rose | Queen Isabella II, imperf | |||
| - | 1r | bl | Queen Isabella II | |||
| - | 2r | brnlil | Queen Isabella II, imperf |
1933, Apr Manuel Ruiz-Zorrilla 100th issue p. 14
| X | 25c | lk | Manuel Ruiz Zorrilla |
1934, Apr 1934 issue (6 stamps)
| X | 5c | brn | Ibanez | — | — | |
| X | 10c | grn | Mariana Pineda (1935) | |||
| X | 15c | grn | Concepción Arenal | |||
| X | 30c | car | Ramón y Cajal | — | — | |
| X | 30c | carrose | Azcarate (1935) | — | — | |
| X | 50c | dkbl | Salmeron (1935) | — | — |
1936, Apr 2
| - | 10c | brnblk | Madrid arms | 10.–100 | 10.–100 | |
| - | 15c | dkgrn | Madrid arms | 10.–100 | 10.–100 |
1938, Apr
| X | 40c | ver | Republic | — | — | |
| X | 45c | carrose | Republic | — | — | |
| X | 50c | ultra | Republic | |||
| X | 60c | dkbl | Republic | — | — |
1938, Apr 13 7th Anniversary of the Republic issue ovpted
| - | 45c on 15c | vio | meeting country girls |
1951, Apr 22 Queen Isabella 500th issue Isabel the Catholic (5 stamps)
| X | 50c | brn | Isabel the Catholic | |||
| - | 75c | bl | Isabel the Catholic | |||
| X | 90c | rosebrn | Isabel the Catholic | |||
| - | 1.50p | org | Isabel the Catholic | |||
| - | 2.80p | olgrn | Isabel the Catholic |
1959, Apr 1
| X | 80c | blk & grn | Civil War memorial |
1961, Apr 17 Velazquez death 300th issue
| X | 80c | self-portrait (Velázquez) | ||||
| - | 1p | brnred & brncar | Conde Duque de Olivares - Velazquez | |||
| - | 2.50p | Infanta Dª Margarita - Velazquez | ||||
| X | 10p | Las hilanderas-fragmentoVelázquez |
1962, Apr 10 Theresian reform 400th issue
| X | 25c | convent | ||||
| X | 1p | redbrn | St Theresa by Bernini | |||
| X | 3p | St Theresa by Velazquez |
1964, Apr 1 peace 25th issue (14 stamps)
| X | 25c | multi | ||||
| X | 30c | multi | ||||
| X | 40c | gld & blk | ||||
| X | 50c | multi | ||||
| X | 70c | multi | ||||
| X | 80c | multi | ||||
| X | 1p | multi | ||||
| X | 1.50p | multi | ||||
| X | 2p | multi | ||||
| X | 2.50p | multi | ||||
| X | 3p | multi | electrification | |||
| X | 5p | multi | Scientific research | |||
| X | 6p | multi | tourism | |||
| X | 10p | multi | General Franco |
1964, Apr 23 New York World's Fair 1964 issue
| X | 1p | bl & grn |
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