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    

Ckstamps : Us Old Stamps Scott #141 15c 1870 Mint H/og 2014 Cv $7500 W/pf Cert.Ckstamps: Us Stamp Collection Scott#534b Mint H Og With Pf CertUs Sc #c14 - 1930 $1.30 Zeppelin Mnh Og Weiss CertU.s. #573 Choice Mint Xf/sup Nh W/cert - 1922 $5.00 Freedom ($425)Drbobstamps Us Scott #4 Mint Sound Stamp No Gum As Issued, Graded Pse CertDrbobstamps Us Scott #595 Mint Og Nh Scarce Stamp With Graded Pse CertificateU.s. #528 Choice Mint Xfsup Nh Jumbo W/cert - 2c Carmine, Ty Vi ($200)Ckstamps: Us Stamp Collection Scott#208 Unused Ng With Pf CertUs Sc #c13 - 1930 65c Zeppelin Mnh Og Xf Weiss Cert Grade 85Drbobstamps Us Scott #122 Mint Og Sound Scarce Stamp Graded Pse Certificate238 Used Xf Jumbo 15c Columbian 1893 Graded Pse Certificate 90j Smq $460 No Res!234 Used Xf/superb 5c Columbian 1893 Graded Pse Certificate 95 Smq $225 No Res!Ckstamps: Us Stamp Collection Scott#190 Mint H Og With Weiss CertU.s. #296 Xf/sup Nh W/cert - 1901 4c Pan-american ($1,100)Ckstamps: Us Revenue Stamp Collection Scott#r73c Used With Pf CertCkstamps: Us Stamp Collection Scott#190 Mint H Og With Weiss CertCkstamps: Us Stamp Collection Scott#c6 Mint Nh Og With Psag & Pse Cert Grade 90Ckstamps : Us Old Stamps Scott #278 $5 1895 Mint H/dist. Og 2014 Cv$2000 W/cert.U.s. #1 Choice Used Vf W/cert - 1847 5c Red BrownMr Fancy Cancel Csa 7 Overpaid Drop Cover Richmond 1862 Csa Cert Ex-kaufmannCkstamps: Us Stamp Collection Scott#218 Unused Regum With Psag CertDrbobstamps Us Scott #k8 Mint Og Nh Sound Stamp With Pf CertificateCkstamps: Us Stamp Collection Scott#149 Unused Ng With Weiss CertCkstamps: Us Stamp Collection Scott#232 Mint Nh Og With Psag CertUsa 1863 Csa Sc 11c Greenish Blue Mnh Block Of Four 2014 Pf Certificate ScarceCkstamps: Us Stamp Collection Scott#160 Unused Ng With Weiss CertUs Sc #c15 - 1930 $2.60 Zeppelin Mnh Og Xf Weiss Cert Grade 90U.s. Scott # 42p3 Mint F-vf Ng 1875 High Value (india Proof) W / Certificate Drbobstamps Us Scott #456 Mint Og Nh Scarce Sound Coil Pair, Graded CertificateDrbobstamps Us Scott #422 Mint Og Nh Scarce Sound Stamp, Graded Pse CertificateDrbobstamps Us Scott #277 Mint Og Vlh Scarce Stamp With Aps CertificateCkstamps: Us Revenue Stamp Collection Scott#r83a Used With Weiss CertCkstamps: Us Stamp Collection Scott#275 Mint Hr Og With Aps CertDrbobstamps Us Scott #225 Mint Og Scarce Sound Stamp With Graded Pse CertificateU.s. #69 Choice Used Vf W/cert - 12c Black ($100)Us #68a Used With Removed Pen Cancel - Includes 1998 Pse CertU.s. #179 Used Jumbo W/cert - 5c BlueU.s. #276 Choice Used Vf App W/cert - $1.00 Black, Type I ($100)Us R44c 25c Certificate Uncanceled 1867 Document - Promissary Note Ckstamps: Us Stamp Collection Scott#jq4 Mint Nh Og With Pf & Psag CertUsa 1879 Scott J4 5c Brown Postage Due Stamp 2014 Pf Certificate ScarceMint Stamp Collection Us Airmail # C46 Mog Nh With Pse Cert Graded F 70Ckstamps: Us Stamp Collection Scott#357 Mint H Og With Pf CertDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No ReserveBuyingblue: Sc# 133a (1869) Ngai Vf-xf W. 2013 Certificate932, 3c Franklin D. Roosevelt, Pse Graded Superb 98 Nh Certificate, Smq $65Ckstamps: Us Stamp Collection Scott#c5 Mint Nh Og With Pse Cert Grade 80Mint Stamp Collection Us # 1332b Pair Mog Nh With Pse Cert Graded Xf 90United States Used Sc #j52a 1c Dull Rose Perf 10 Vert Pair Pse Cert.U.s.stamp:revenues:scott#r24a, 5c, Red, "certificate", Issue Of 1862-1871U.s 1978 Certificate Of Mailing With Non-denominated "a" Stamp, Used, Sc 1736U.s 1978 Certificate Of Mailing With 10c Jefferson Memorial Stamp, Used, Sc 1510Dr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No Reserve319, 2c 1903 Washington, Used, Pse Grade 90 Cert, Smq $65220, 1890 2c Carmine, Pse Grade Xf 90 Cert, Used, Smq $45U.s. #e17 Xf-s Nh W/pse Cert 95 Smq $40.00Usa 1862 Csa Sc 6 Light Blue Mnh/lh Block Of Four 2014 Pf Certificate Scarce1880s Internal Revenue Certificate Stamp 101862-71 5c U.s. Internal Revenue, Certificate, Washington Scott R24c Used