Now showing: North Vietnam - Postage stamps (1946 - 1976) - 1 stamps.
1. May WM: None Perforation: 11
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![[Construction of the Xuan Quan Sluice, type AO]](https://www.stampworld.com/media/catalogue/North-Vietnam/Postage-stamps/AO-s.jpg)
![[Construction of the Xuan Quan Sluice, type AO1]](https://www.stampworld.com/media/catalogue/North-Vietnam/Postage-stamps/AO1-s.jpg)
