How can I purchase the stamps of UPU member countries and their territories?
The UPU’s WADP Numbering System (WNS) provides helpful links to the online philatelic shops of designated operators. It can be consulted here.
How can I tell if a stamp in my collection is genuine?
The UPU’s WADP Numbering System (WNS) is a useful resource that allows collectors and philatelists to verify the authenticity of postage-stamps registered by its 191 member issuers. It can be consulted here.
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