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

R. A. Siegel Auction Galleries

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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First shown in 2008 to celebrate the Smithsonian National Postal Museum's 15th anniversary, Alphabetilately is esse… [read review or visit site]



Clubs & Associations

Most watched eBay auctions    

U.s. #242 Used Beauty W/cert - 1893 $2.00 Columbian ($600)Drbobstamps Us Scott #45 Very Scarce Mint Re-issue W/ Pf Cert. 2016 Cat. $3250Drbobstamps Us Scott #127 Scarce Mint Stamp W/ Aps Cert. 2016 Cat. $2000U.s. #311 Unused Xf/sup W/cert - 1902 $1.00 Farragut ($600)U.s. #30a Scarce Mint W/cert - 5c Brown, Ty Ii ($2,200)U.s. #519 Scarce Mint Nh W/cert - 2c Carmine, P11, Dlw ($850)U.s. #75 Scarce Unused W/cert - 5c Red Brown ($2,200)U.s. #38 Unused Beauty W/ Cert - 30c Orange ($800)Drbobstamps Us Scott #101 Scarce Used Stamp W/ Aps Cert. 2016 Cat. $2250U.s. #155 Choice Used Vf App W/cert - 90c Carmine ($350)Us Scott 400 Mint Xf/superb With Pse CertificateDrbobstamps Us Hawaii Scott #10 Mint Re-issue Pos. 4 On Plate W/ Aps CertificateSalem Railroad Of Nj 1864 Civil War Era Stock Certificate W/ R46b Revenue StampU.s. #302 Mint Xf Nh App W/cert - 1901 5c Lincoln ($150)U.s. #399 Choice Used Xf/sup W/cert - 1913 5c Pan-pacific ($225)Us, #94 On Cover W/fancy Cancel..w/pse Certificate & One Other Stamp Us Guam 1899 Mognh Sc#6 With Pf Certificate Mounted On Page.644 Nh - Comes With Graded Cert By PseUs Guam 1899 Mognh Sc#7 With Pf Certificate Mounted On Page. Vf-xfCsa Confederate 1860's Adversity Cover On Certificate Of Impressment - Scott 12Hawaii, #24, Unused, Hps Cert. Hawaiian.486, Mint Xf Nh 1¢ Coil Pair With Pse Certificate - Stuart KatzDavid Peterman Hand Painted Fdc. Sylvester & Tweety No. 1 Of 3 With Cert.Scott # R44c, Used, F, 25¢ Certificate, 1862, First National Bank Cooperstown NyScott # R44c, Used, Vg, 25¢ Certificate, 1862, L R Kibby, Agent, St. Albans, VtScripophily Vintage Certificate U.s.a (y30) Combined Postage On All ItemsDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No Reserve