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    

Drbobstamps Us Scott #292 Mint Well Centered Scarce Stamp Graded Pse CertificateDrbobstamps Us Scott #546 Mint Og Nh Stamp With Clean Pf CertificateU.s. #27 Used Beauty W/cert - 5c Brick Red ($1,825)Drbobstamps Us Scott #1a Mint Og Rare Stamp With Pse Certificate, Cat $6750Us 315 Vf Og Lh 5 Cent Lincoln Imperf, Weiss Cert.Us 291 50c Trans Miss F-vf Og Lh Weiss Cert.Ckstamps : Us Stamps Scott #2 10c Black 1847 Used Regum 2014 Cv$1000 W/pse Cert.Ckstamps: Us Stamps Scott#85 3c Rose 1867 D-grill Used 2014 Cv$1100 W/pse Cert.Drbobstamps Us Scott #79-e15c Mint Og Scarce Stamp, Clean Graded Pse CertificateUs Stamp Scott # 8a Intensely Blue Beautiful, Ample 4- Margins,weiss CertificateCkstamps: Us Stamp Collection Scott#115 Used With Pse Cert Grade 80Drbobstamps Us Scott #24 Used Stamp With Clean Pse CertificateDrbobstamps Us Scott #366 Mint Og Nh Scarce Stamp Clean Graded Pse CertificateUnited States ** 1994 Legends Of The West Error Sheet Of 20v - Mnh Cert. G36804Drbobstamps Us Scott #499 Mint Og Nh Jumbo Gem Stamp With Clean Pf CertificateHawaii, #9, Unused, Hps Cert. HawaiianCkstamps: Us Stamp Collection Scott#440 Mint Og With Pf CertUs 311 Vf Og Lh $1 Farragut, Pse Cert.U.s. #456 Scarce Used Pair W/cert - 3c Violet, Rotary Coil ($650)Us 25c Newspaper, 1865 Sc Pr3a Ngai Cat Value $425 With CertDrbobstamps Us Scott #288 Mint Og Nh Stamp With Clean Graded Pse CertificateUs Scott # 62 B (very Nice) With Recent Weiss Certificate.1996 Sc 3112c Major Imperf Error With Certificate Cv $50[seb21] Usa 1860 Scott 37a Stamp Used - See Certificate[seb16] Usa 1862 Scott 70 Stamp Used - See CertificateCkstamps : Us Stamps Scott #85b 2c Black 1867 Z-grill Used Cv$1300 W/aps Cert.Ckstamps: Us Stamp Collection Scott#217 Unused Regum With Pse Cert[seb7] Usa 1867 Scott 89 Stamp Used - See Certificate[seb8] Usa 1867 Scott 92 Stamp Used - See Certificate[seb28] Usa 1893 Scott 242 Stamp Used - See Certificate[seb25] Usa 1851 Scott 7 Stamp Used - See Certificate[seb29] Usa 1909 Scott 353 Stamp Used - See CertificateDr Jim Stamps Old Us Revenue Scott R7 2c Certificate Used No ReserveUs $60 Newspaper, 1879 Sc Pr79 H Cat Value $850 With CertU.s. Number 11 Unused With Professional Stamp Experts Certificate[seb31] Usa 1930 Scott C14 Stamp Used - See CertificateU.s. Stamp, Scott # 115, Used, W/aps CertificateHawaii #42 - Pse Cert Graded 80j - Nice[seb5] Usa 1869 Scott 115 Stamp Used - See Certificate[seb6] Usa 1867 Scott 97 Stamp Used - See Certificate[seb3] Usa 1869 Scott 116 Stamp Used - See CertificateSeries Of 1918 War Savings Certificate[seb9] Usa 1870 Scott 152 Stamp Used - See Certificate[seb27] Usa 1890 Scott 229 Stamp Used - See CertificateIpms '87 Souvenir Card "$20 Gold Certificate (back)" Memphis Tennessee[seb17] Usa 1861 Scott 69 Stamp Used - See CertificateUs Revenue Inl&foreign Exchange, Certificate Stamp Set Old, Nice Cancels972, 1948 Indian Centennial, Pse Graded Superb 98 Nh Certificate, Smq $55[seb1] Usa 1869 Scott 119 Stamp Used - See CertificateUs #c46 Ognh W/pse Cert. - Graded 95 - Smq $40Us #968 Ognh W/pse Cert. - Graded 95 - Smq $20[seb18] Usa 1861 Scott 68 Stamp Used - See Certificate[seb4] Usa 1869 Scott 112 Stamp Used - See CertificateAna '77 Souvenir Crd "$5 Silver Certificate (chief Running Antelope)"atlanta Ga U.s.stamp:scott#r24a, 5c, Red, Imperforate, "certificate" Issue Of 1862-1871[seb15] Usa 1863 Scott 76 Stamp Used - See Certificate[seb20] Usa 1861 Scott 63 Stamp Used - See Certificate[seb13] Usa 1920 Scott 533 Stamp Used - See CertificateDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No Reserve