As with coins and baseball cards, in recent years some stamp collectors have started submitting their stamps to grading agencies for "expertising". Some of the well-known organizations which issue certs for stamps include PSE, Weiss, PF and APS.

Some stamps will be sold with an existing cert, and other sellers will offer the buyer the opportunity to have a stamp graded and examined by a third party before completing the transaction. As with any collecting purchase, cert or not, caveat emptor!


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National Postal Museum

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If you're into postal history or collectibles, check out the Smithsonian's National Postal Museum. This extensive s… [read review or visit site]

R. A. Siegel Auction Galleries

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This auction house site offers an extensive online database of US stamp information. Includes PDF catalogs of past … [read review or visit site]

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Private Die Proprietary Stamps

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Alphabetilately

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Clubs & Associations

Most watched eBay auctions    

U.s. #244 Choice Used Vf W/cert - 1893 $4.00 Columbian ($1,050)Usa Scott # 2 Genuine With German Certificate (hs1/g949)U.s. #222 Choice Mint Xf Nh W/cert - 1890 4c Lincoln ($275)Nystamps Us Stamp # 392 Mint Og Nh $400 Line Pr Franklin CertificateNoblespirit No Reserve Superb U.s. 459 Mint Nlh Pair = $600 Cv With Pf CertU.s. #237 Choice Mint Vf Nh W/cert - 1893 10c Columbian ($285)Used $4.00 Columbian, Scott 244, Xf Centering, 2015 Pf Cert -- Reperfed At Top.Nystamps Us Duck Stamp # Rw3 Mint Og Nh $350 CertificateHawaii #72 Rare Vertically Split Overprint With Certificate "genuine"Nystamps Us Stamp # 85 Used $1100 Grill Certificate1995 Baseball Cal Ripken Jr Record Breaking Bevil Hand Painted Cachet + CertNystamps Us Stamp # 95a Mint Og H $4750 Grill CertificateMint Stock With $5 Columbian #245 Trans To 8c With Cert Nh Cat $17285U.s. #3363c Mint W/cert - 33c Reindeer, Imperf Block ($100)U.s. #78 Used W/cert - 24c Dark Lilac ($350)1916 Aurora Mining Co.,nevada/signed President Weldon Stock Certificate/stamps2002 #3709 Indiana Greetings Pork Beans 37c Fdc Bevil Hand Painted Cachet + CertUs Stamp:#r24a 5c Certificate 1862-71 Revenue Imperf Stamp Pair $35Nystamps Us Stamp # 447 Used $375 Pr Washington CertificateCanal Zone #19 Var Mint W/cert - 8c On 50c Bistre10 Cent Certificate Revenue Stamp Scott# R33a2007 #4136 Jamestown Settlement 41c Fdc Bevil Hand Painted Cachet Cover + CertScott #11 Vf Plated 7l2l - Pse Certificate - Graded Vf 80Usa Bank Check Insurance Certificate Postmarks Revenues(approx 60 Stamps)g109722002 #3726 New Mexico Greetings 37c Fdc Bevil Hand Painted Cachet + Cert2005 3911 Henry Fonda Hollywood Legends 37c Fdc Bevil Hand Painted Cachet + Cert2002 #3723 Nevada Greetings Cowboy 37c Fdc Bevil Hand Painted Cachet + CertScott 611. Schermack Iii Block Of 4. Nh. Pse Certificate W/ Few Noted Issues.Nystamps Us Stamp # 15 Used $160 Certificate2010 #4468 Calvin Hobbes Sunday Funnies 44c Fdc Bevil Hand Painted Cachet + CertScott #291 Mint 1898 Gold Prospector Pf Certificate Cv $600.002010 #4471 Dennis Menace Sunday Funnies 44c Fdc Bevil Hand Painted Cachet + Cert2010 #4449 Gene Autry 44c Fdc Bevil Hand Painted Cachet Cover + CertUsa Early Revenues Bank Check Certificate Lot(appx 100 Stamps)g113261998 #3235 Klondike Gold Rush 32c Fdc Bevil Hand Painted Cachet Cover + Cert2001 Golf Tiger Woods 4 Consecutive Majors Bevil Hand Painted Cachet + Cert2001 #3523 Lucille Ball 34c Fdc Bevil Hand Painted Cachet Cover + CertThirteen Us Revenue Certificate Stamps - UsedNystamps Us Stamp # 913 Mint Og Nh Pse Xf90 CertificateNystamps Us Stamp # 26 Mint Og H $65 Certificate1998 Baseball Mark Mcgwire Record Breaking Bevil Hand Painted Cachet + CertUsa Old Revenues Bank Check Agreement Certificate(apprx 65 Stamps)g113242010 #4475 Mother Teresa 44c Fdc Bevil Hand Painted Cachet Cover + CertUsa Early Revenues Certificate Agreement(apprx 70 Stamps)g11302Usa Early Revenues Certificate Agreement Exchange (apprx 70 Stamps)g11301Usa Early Revenues Exchange Certificate(approx 90+stamps)g113252007 Tuskegee Airmen Lee Archer Event Cover Bevil Hand Painted Cachet + CertUs Revenue Stamp 1862 Scott # R44c 25c Brn Red Washington Certificate 2010 #4470 Garfield Sunday Funnies 44c Fdc Bevil Hand Painted Cachet + CertUsa Certificate Exchange Early Revenues Lot(approx 70 Stamps)g11327Nystamps Us Duck Stamp # Rw43 Mint Og Nh $18 Certificate Pse Xf Sup 95Mr Fancy Cancel 541 3c Perf 11x10 Mint Never Hinged Perf Disk Pse Cert Cv$1002010 #4469 Archie Sunday Funnies 44c Fdc Bevil Hand Painted Cachet + Cert2010 #4467 Beetle Bailey Sunday Funnies 44c Fdc Bevil Hand Painted Cachet + CertDr Jim Stamps Us Certificate Of Purchase Postal Card Aram Kansas 1951Nystamps Us Duck Stamp # Rw44 Mint Og Nh $18 Certificate Pse Xf902010 #4446 Roy Rogers Cowboys 44c Fdc Bevil Hand Painted Cachet + CertPj's #294 - Xf/sup 95 W/ Pse Cert - Mnh W/ Tiny Gum Dist. - Awesome And On Sale!Dr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No Reserve