Now showing: Montenegro - Postage-due stamps (1910 - 1913) - 4 stamps.
1. April WM: None Perforation: 12½
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![[King Nicholas I, type E]](https://www.stampworld.com/media/catalogue/Montenegro/Postage-due-stamps/E-s.jpg)
![[King Nicholas I, type E1]](https://www.stampworld.com/media/catalogue/Montenegro/Postage-due-stamps/E1-s.jpg)
![[King Nicholas I, type E2]](https://www.stampworld.com/media/catalogue/Montenegro/Postage-due-stamps/E2-s.jpg)
![[King Nicholas I, type E3]](https://www.stampworld.com/media/catalogue/Montenegro/Postage-due-stamps/E3-s.jpg)
