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”)

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 #291 Sound Mint Og Lh Well Centered Stamp Pf CertificateU.s. #1 Choice Used Vf W/cert - 1847 5c Red BrownU.s. #93 Choice Used Xf W/cert - 2c Black JackDrbobstamps Us Scott #c14 Sound Mint Og Vlh Stamp With Clean Pf CertificateMr Fancy Cancel 63 X4 On Cover Carrier Rate New York Pf Cert As Deep BlueNystamps Us Stamp # 369 Mint Og Nh $320 Bluish Paper Washington W/certU.s. #14 Choice Used W/cert - 10c Green, Type Ii ($160)Ckstamps : Us Stamps Scott #243 $3 Columbian 1893 Mint H/og Cv$1600 W/aps Cert.Nystamps Us Duck Stamp # Rw5 Mint Og Nh $475 W/certScott #78, 1863 24-cent Lilac. Nyfm Fancy Cancel. Pse Certificate; Cv=$350.Us Stamp:#431 8c Olive 1914-15 Mnh/og Stamp + Certificate Pse Xf90Us#k13 Vf 80 Mint Og Pse CertUs Stamp:#433 10c Orange Yellow 10p. Mnh/og Stamp + Certificate Pse Xf 90Us#72 Used 90 Cent Pse Cert Cv $425.00U.s. #503 Choice Mint Vf/xf Nh W/cert - 4c Brown, P11Sb1 Stamps - 1869 12c Adriatic Pictorial W/pf Cert & Weiss Verified Mnh; Sc. 117U.s. 5ct 1961 Buff Scott #67 Red Grid Cancel - Weiss Certificate - $960 ScottNystamps Us Stamp # 156 Mint $225 W/certUs#291 Used Pse Cert Cv$210.00Hawaii 1859-63 Scott #16 W/certificate, Used "islani" Variety [id:8729]U.s. #447 Choice Mint Xf/sup W/cert - 5c Blue, P10 CoilU.s. #508 Choice Mint Vf/xf Nh W/cert - 8c Olive Green, P11U.s. #526 Choice Mint Vf/xf Nh W/cert - 2c Carmine Rose ($57)Us#k13 Vf 80 Mint Og Pse CertU.s. #606 Choice Mint Superb Nh W/cert - 2c Carmine, CoilU.s. #232 Chouce Xf/sup Jumbo W/cert - 3c ColumbianUs Stamp:#424 1c Green 1914-15 10p. Mnh/og Stamp + Certificate Pse Xf Superb 95Us Stamp:#432 9c Salmon Red 1914-15 Mnh/og Stamp + Certificate PfUs Stamp:#426 3c Violet 1914-15 Mnh/og Stamp + Certificate Pse Xf 90U.s. #348 Scarce Used Pair W/cert - 1c Green, P12 Coil ($140)119 Used With Pse Cert Cat $225Scott 387 1 Cent Coil Line Pair Forgery Made From 383 Pair ~ Weiss CertificateJ38 (1c Postage Due) Mnh O.g. Fresh Bureau Strip W/plate# 2014 Cert $135 Cat.U.s. #627-28 Choice Xf/sup Nh W/cert - 1926 2c - 5c IssuesUs#291used Pse Cert Cv $210.00#305, 6c Garfield, Xf-og-nh, With 2005 Pf Cert., Scott Is $150 - Rupp BrothersUs Stamp:#427 4c Brown 1914-15 Slwm 10p. Mnh/og Stamp + Certificate Us Stamp:#434 11c Dark Green 1914-15 Slwm 10p. Mnh/og Stamp + Certificate U.s. #541 Choice Mint Vf Nh W/cert - 3c Violet, Rotary ($100)Us Stamp:#442 2c Carmine 1914 Flat Plate 10p. Coil Mnh/og +certificate Xf-sup95Us Stamp:#455 2c Carmine Type Iii 1914-16 10p. Mnh/og Coil Stamp + CertificateScott #577 Mint Nh 1923 Washington Gem 100 Pse CertificateUs Stamp:#443 1c Green 1914 Flat Plate 10p. Mnh/og Stamp + CertificateScott #1002 Mint Nh 1951 Chemicals Pse Slab Certificate Superb 98Scott #1013 Mint Nh 1952 Service Women Pse Slab Certificate Superb 98Scott #777 Mint Nh 1936 Rhode Island Pse Slab Certificate Xf-superb 95Scott #788 Mint Nh 1937 Army Pse Slab Certificate Xf-superb 95Scott #215 Mint 1888 Carmine Jackson Certificate Cv $225.00Us #454 -- Coil Joint Line Pair--mint--with Pf Cert ( Cat Value $425)Us #11 Margin Singles On Two Covers, One With Cert.U.s. #412 Mint Pair W/cert - 1c Green, P8.5 Coil ($60)Scott #1009 Mint Nh 1952 Grand Coulee Pse Slab Certificate Superb 98Scott #1012 Mint Nh 1952 Engineering Pse Slab Certificate Superb 98Scott #1005 Mint Nh 1952 4-h Club Pse Slab Certificate Superb 98Scott #1017 Mint Nh 1953 National Guard Pse Slab Certificate Superb 98R24a Certificate W/dated Manuscript CancelNystamps Us Postage Due Stamp # J66 Used P#12 & Star Blue Cancel W/certUs #503 Unused Og Nh Plate Single - With Aps Certificate Nr!A0076 U.s. Revenue Scott R24a, 5-cent Certificate ImperforateDr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No Reserve