Stamp expertise

Find Your Stamps Value

A professional stamp expert and an appraisal site. People can search for the value of their stamps, with links to dealers, thru their database
Grupo Afinsa

One of Spain's largest investment companies in the tangible assets area and professional stamp experts (collectibles such as stamps, coins, art and antiques)
Maison Williame

The oldest philatelic auction house in Belgium, they also are, professional stamp experts in appraisals of Belgian colonial stamp issues
PSE Professional Stamps Expert

Site representing a company of professional stamp experts providing value-added grading and authentification services on US postage stamps
WADP Numbering System (WNS)

Site developed by the Universal Postal Union (UPU) and the World Association for the Development of Philately (WADP) to create a database of all authentic stamps issued by UPU member countries

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2-Clicks Stamps

Postage stamp collecting directory & philatelic guide