Stamps of Cuba, 10 May 1965
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1965, May 10 International Quiet Sun Year issue unwmk p. 10 (6 stamps)
| - | 1c | multi | Sun & Earth's magnetic pole | |||
| X | 2c | multi | ||||
| X | 3c | multi | Earth´s Magnetic FieldHorizon | |||
| - | 6c | multi | Atmospheric currents | |||
| - | 30c | multi | Solar rays | |||
| - | 50c | multi | Effect on satellite orbits |
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