Sýni: Norður Víetnam - Official stamps (1953 - 1968) - 1 frímerki.
12. ágúst WM: Ekkert Götun: 12½
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![[World Trade Union Congress - Leipzig, Germany, tegund F]](https://www.stampworld.com/media/catalogue/North-Vietnam/Official-stamps/F-s.jpg)
![[World Trade Union Congress - Leipzig, Germany, tegund F1]](https://www.stampworld.com/media/catalogue/North-Vietnam/Official-stamps/F1-s.jpg)
![[World Trade Union Congress - Leipzig, Germany, tegund F2]](https://www.stampworld.com/media/catalogue/North-Vietnam/Official-stamps/F2-s.jpg)
![[World Trade Union Congress - Leipzig, Germany, tegund F3]](https://www.stampworld.com/media/catalogue/North-Vietnam/Official-stamps/F3-s.jpg)
