Great Scientific Discoveries 1987
Now showing: Grenada - Postage stamps - 1987 - Great Scientific Discoveries - 4 stamps.
1987
Great Scientific Discoveries
9. September WM: None Perforation: 14
![[Great Scientific Discoveries, type AYY]](https://www.stampworld.com/media/catalogue/Grenada/Postage-stamps/AYY-s.jpg)
![[Great Scientific Discoveries, type AYZ]](https://www.stampworld.com/media/catalogue/Grenada/Postage-stamps/AYZ-s.jpg)
![[Great Scientific Discoveries, type AZA]](https://www.stampworld.com/media/catalogue/Grenada/Postage-stamps/AZA-s.jpg)
![[Great Scientific Discoveries, type AZB]](https://www.stampworld.com/media/catalogue/Grenada/Postage-stamps/AZB-s.jpg)
| No. | Type | D | Color | Description |
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| 1713 | AYY | 50C | multicoloured | Isaac Newton holding Apple (Law of Gravity) | 1.19 | - | 1.19 | - | USD |
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| 1714 | AYZ | 1.10$ | multicoloured | John Jacob Berzelius and Symbols of Chemical Elements | 2.37 | - | 2.37 | - | USD |
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| 1715 | AZA | 2$ | multicoloured | Robert Boyle (Law of Pressure and Volume) | 3.56 | - | 3.56 | - | USD |
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| 1716 | AZB | 3$ | multicoloured | James Watt and Drawing of Steam Engine | 4.74 | - | 4.74 | - | USD |
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| 1713‑1716 | 11.86 | - | 11.86 | - | USD |
