Τώρα εμφανίζεται Ζώνη της Διώρυγας - Ταχυδρομικά τέλη λόγω γραμματοσήμων (1920 - 1929) - 13 Γραμματόσημα.
1. Ιούλιος WM: Κανένα Διάτρηση: 11
![[US Postage Due Stamps Overprinted, τύπος D]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/D-s.jpg)
![[US Postage Due Stamps Overprinted, τύπος D3]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/D3-s.jpg)
| Νούμερο | Τύπος | D | Χρώμα | Περιγραφή |
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| 11 | D | 1C | ΚΟΚΚΙΝΟ ΚΑΡΜΙΝΙΟΥ | "A" with flat top | - | 84,35 | 26,36 | - | USD |
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| 11A* | D1 | 1C | ΚΟΚΚΙΝΟ ΚΑΡΜΙΝΙΟΥ | - | 8,44 | 2,64 | - | USD |
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| 12 | D2 | 2C | ΚΑΦΕΤΙ ΚΑΡΜΙΝΙΟ | "A" with flat top | - | 52,72 | 8,44 | - | USD |
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| 12A* | D3 | 2C | ΚΑΦΕΤΙ ΚΑΡΜΙΝΙΟ | - | 12,65 | 4,22 | - | USD |
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| 13 | D4 | 10C | ΚΑΦΕΤΙ ΚΑΡΜΙΝΙΟ | "A" with flat top | - | 210 | 52,72 | - | USD |
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| 13A* | D5 | 10C | ΚΑΦΕΤΙ ΚΑΡΜΙΝΙΟ | - | 158 | 15,82 | - | USD |
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| 11‑13 | Τοποθετώ/Ορίζω (* Stamp not included in this set) | - | 347 | 87,52 | - | USD |
Φεβρουάριος WM: Κανένα Διάτρηση: 11
![[Panama Canal Zone Postage Stamps Overprinted "POSTAGE DUE", τύπος E]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/E-s.jpg)
![[Panama Canal Zone Postage Stamps Overprinted "POSTAGE DUE", τύπος E1]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/E1-s.jpg)
![[Panama Canal Zone Postage Stamps Overprinted "POSTAGE DUE", τύπος E2]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/E2-s.jpg)
16. Δεκέμβριος WM: Κανένα Διάτρηση: 11
![[Panama Canal Zone Postage Stamp Surcharged, τύπος F]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/F-s.jpg)
![[Panama Canal Zone Postage Stamp Surcharged, τύπος F1]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/F1-s.jpg)
![[Panama Canal Zone Postage Stamp Surcharged, τύπος F2]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/F2-s.jpg)
![[Panama Canal Zone Postage Stamp Surcharged, τύπος F3]](https://www.stampworld.com/media/catalogue/Canal-Zone/Postage-due-stamps/F3-s.jpg)
