Now showing: Trieste Zone B - Postage stamps - 1951 - International Labor Day - 2 stamps.
1. May WM: None Sheetsize: 25 Design: B. Jakac Perforation: 12½
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![[International Labor Day, type X]](https://www.stampworld.com/media/catalogue/Trieste-Zone-B/Postage-stamps/X-s.jpg)
![[International Labor Day, type X1]](https://www.stampworld.com/media/catalogue/Trieste-Zone-B/Postage-stamps/X1-s.jpg)
