Ühendriigid
Praegu kuvatakse: Ühendriigid - postmargid (1847 - 2024) - 1 margid.
1973
Progress in Electronics
10. juuli WM: mitte ükski perforatsioon: 11
![[Progress in Electronics, Tüüp AJG]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/AJG-s.jpg)
![[Progress in Electronics, Tüüp AJH]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/AJH-s.jpg)
![[Progress in Electronics, Tüüp AJI]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/AJI-s.jpg)
| Nr | Tüüp | D | Värv | Kirjeldus |
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| 1273 | AJG | 6C | mitmevärviline | (53 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1274 | AJH | 8C | mitmevärviline | (160 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1274Er | Black omitted | 644 | - | - | - | USD | |||||||||||
| 1274Er2 | Tan and lilac omitted | 1611 | - | - | - | USD | |||||||||||
| 1275 | AJI | 15C | mitmevärviline | (39 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1275Er | Black omitted | 1611 | - | - | - | USD |
