Now showing: Switzerland - UPU (1957 - 2012) - 1 stamps.
28. November WM: None Design: Burkard Waltenspül. Perforation: 13¼
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![[UPU - Inscription "Union Postale Universelle", type I]](https://www.stampworld.com/media/catalogue/Switzerland/UPU/I-s.jpg)
