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!


Best of the Web (“Hall of Fame”)

1847USA

1847USA

Bob Allen's beautiful and well organized catalog of US stamps from 1847 to 1970 is a fantastic resource for all US … [read review or visit site]

The Stamp Collecting Round-up

The Stamp Collecting Round-up

Don Schilling's long-running, in-depth blog on stamp collecting and postal operations. Schilling stays up on all th… [read review or visit site]

National Postal Museum

National Postal Museum

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]

Post Office in Paradise

Post Office in Paradise

Post Office in Paradise showcases Hawaiian postal history from the years before Hawaii became a part of the United … [read review or visit site]

Private Die Proprietary Stamps

Private Die Proprietary Stamps

Bob Hohertz's impressive database of U.S. Private Die Proprietary stamps from the Civil War and Spanish American Wa… [read review or visit site]

Alphabetilately

Alphabetilately

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    

Us Stamp:#65 3c Washington 1861-62 Issue Mnh/og Stamp + CertificateU.s. #245 Unused Beauty W/cert - $5.00 Columbian ($1,200)Drbobstamps Us Scott #461 Sound Mint Og Hinged Stamp With Pf CertificateUs Stamp:#206 1c Blue 1881 American Bank Note Mnh/og Stamp + CertificateU.s. #545 Scarce Used W/cert - 1c Green, P11 Rotary ($200)U.s. #9x1 Used Beauty W/cert - 5c New York Provisional ($650)#1 Used Red Grid Cancel Pair With Pf Certificate - 4 MarginsMr Fancy Cancel 93 + 112 On Cover Henniker Nh Cds Docketed Sept 1869 Pf Cert Us Stamp:#232 3c 1893 Columbian Issue Mnh/og Stamp 95+ Certificate Pse Csa #8 Choice Mint Xf/sup Nh Pr W/cert - 2c Red BrownJ57 Vf Mint Og Nh Pf CertUs 1847 Used Sc#1 5Us Stamp:#231 2c 1893 Columbian "broken Frame Line" Mnh/og + Certificate Pse VfDrbobstamps Us Scott #650 Mnh Stamp With Graded Pse CertificateHawaii #53 Vertically Split Overprint With Cert Only 25 KnownU.s. #7 Choice Used Vf W/cert - 1c Blue, Ty Ii ($145)Scott #349 Washington Mint Paste-up Pair Nh W/weiss Cert Scott Cv $575 (lot 3)Us Stamp:#247 1c Blue 1894 Bureau Issue Mnh/og Stamp + CertificateCsa #6 Mint Superb Nh W/cert - 5c BlueUs Stamp:#214 3c Vermilion 1887 American Bank Note Mnh/og Stamp + CertificateUs Stamp:#230 1c 1893 Columbian Issue Mnh/og Stamp + Certificate Pse Vf XfUs Stamp:#250 2c Carmine (i) 1894 Bureau Issue Mnh/og Stamp + CertificateJ61a Xf Mint Og Nh Pse Cert Graded 95Nystamps Us Philippine Stamp # 239 Mint Og H $900 W/ CertHawaii #66b "no Period" Error With Certificate "genuine"Us Scott 240-1893 50 Cent Columbian With Cert.mint/hinged/original Gum-see Disc.85b 2c Black 1867 Z-grill Used Cv$1300 W/aps Cert.Dr Jim Stamps Old Us Revenue Scott R7a 2c Certificate Imperforate Pair $45 Cv NrMr Fancy Cancel Scott R33c Used 10c Certificate Hand Stamp Cancel Hawaii #3 Missionary With Certificate "counterfeit"Dr Jim Stamps Old Us Revenue Scott R24b 5c Certificate Part Imperf $15 Cv NrHawaii #72 Double Overprint W/ Certificate "genuine" Catalog $1,000+Us Stamp:#1897b "omnibus" Major Imperf Error Pair Mnh Stamp $500 + CertificateDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveUs Stamp Scott # 34 Intensely Green, Very Scarce +weiss CertificateExceptional Gem Scott #c18 Mint Og Nh - I Would Get A Graded Cert For This#10a With Pse Cert - Nice Pos 97r0 Cv$160.00Dr Jim Stamps Old Us Revenue Scott R24b 5c Certificate Part Imperf Pair $150 CvCkstamps : Us Old Stamps Scott #85e 12c Z-grill 1868 Used 2014 Cv $2500 W/cert.Dr Jim Stamps Old Us Revenue Scott R44a 25c Certificate Imperforate $11 Cv NrDr Jim Stamps Old Us Revenue Scott R33d 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R7a 2c Certificate Imperforate $17.50 Cv NrDr Jim Stamps Old Us Revenue Scott R24a 5c Certificate Imperforate No ReserveDr Jim Stamps Old Us Revenue Scott R7c 2c Certificate Used $32.50 Cv No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Pair Used No ReserveV-stamps, Us Revenue Stamp, R24b, Certificate, Red, Partly Perf., Scv: $150Scott #238 Columbian Mint Stamp W/weiss Cert Scott Cv $225 (lot 11)Dr Jim Stamps Old Us Revenue Scott R33c 10c Certificate Used Orange Cancel NrDr Jim Stamps Old Us Revenue Scott R44b 25c Certificate Part Imperf No ReserveU349 Columbus Used Ada Oh April 11 1893 Certificate Early UsedDr Jim Stamps Old Us Revenue Scott R44b 25c Certificate Part Imperf Pair $40 CvMr Fancy Cancel Scott R44c Used 25c Certificate Hand Stamp Cancel Dr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No Reserve