WNS Numbering System
![](http://photos1.blogger.com/blogger/5288/352/320/2005_upu_new_official_stamp.jpg)
Only those postage stamps that, once received by the International Bureau (IB) of the UPU have undergone the process of verification of authenticity and registration will be attributed a WNS number and added to the WNS website.
On the site you can search either by country or topic.
To go to the WNS website, click here.
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