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    

Hawaii #24 W/cert Plate 7-a Type Ix Pos 9 "genuine"Scott # 244, Us 1893, Columbian $4. Mint Ng Vf-xf 85 With P.s.e Certificate Us Stamps Scott#8a 1c Type Iiia 1851 Franklin Used 2014 Cv$900 W/certUs Scott 278 $5 Dark Green Cv $2000 With Certificate, HU.s. #1 Used W/cert - 1847 5c Red Brown=wow= Us# 278, $5.00 First Bureau Issue, W/ Weiss Cert., Cv $625.00, Free S&hA503 Hawaii #49 Large Maltese Cross - Large Margins - Hps Certificate - Scarce=wow= Us# 144, 90Hawaii #23 Pos 81-viii-7 With CertificateScarce Item! Scotts # 2482a Error With Expertizing Certificate Cv $225.00U.s. #634a Mint Beauty W/cert - 2c Carmine, Type Ii ($325)Hawaii #8 Gem Clear Margins W/cert "genuine"Ckstamps: Us Stamp Collection Scott#24 Used Pair With Aps CertUsed Us Stamp Scott # 63 With A Pse CertificateScott # 238, Us 1893, Columbian 15c. Mint Og/nh Vf 80 With Pse Cert Scott # 239, Us 1893, Columbian 30c. Mint Dog Vf-80 With P.s.e Certificate Us Scott 446 4c Coil Cv $300 With Certificate, HUs Scott #472 Vf-xf Og Lh W/aps CertUs Scott J18 5c Postal Due Cv $625 With Certificate, H1919 Us Opium Manufacturer Distributer Revenue Stamp Certificate Dallas OregonU.s. #212 Choice Mint W/cert - 1c BlueDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No ReserveMint Stamp Collection Us Airmail # C83 Pair Mog Nh W Pse Cert Graded Gem 100U.s. Scott # 42 P3 Mint F-vf Ng 1875 High Value (india Proof) W / Certificate Us Sc 162, Mog,vf, Rare,pse Certificate=wow= Us# 138a, 7Us Stamp:#r7 P4 2c Certificate 1862-71 Revenue Plate Proof Card StampU.s. #439 Mint W/cert - 30c Orange, Perf 10 ($220)Dr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No ReserveC56, Pan-american Games, Pse Graded Gem 100 Nh Certificate, Smq$235Mint Stamp Collection Us Airmail # C73 Mog Nh With Pse Cert Graded Gem 100Mint Stamp Collection Us Airmail # C42 Mog Nh With Pse Cert Graded Superb 98Us Stamp:#unlisted 3c Essay Block Of 12 + Pf CertificateU.s. #216 Mint W/cert - 5c Indigo ($225)Series Of 1919 $5.00 War Savings Certificate Booklet ~ Beautiful ~ CrispUs Stamp:#r44 P4 25c Certificate 1862-71 Revenue Plate Proof Card StampU.s. #146p3 Used W/cert - 2c BrownDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveUs Scott J21 50c Postal Due Cv $1900 With Certificate, HMint Stamp Collection Us Airmail # C82 Mog Nh With Pse Cert Graded Superb 98Rare 1918 War Savings Certificate Stamp Book, One Stamp Attached 1851 U.s. Classic #17 W/ Blue Cancel Imperf With Certificate Cv $335.00Dr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveUs Revenue Stamp Scott R24c - 5 Cent Certificate Blue Son Stamp Cancel Mr Fancy Cancel 394 3c Coil Mint Hinged Small Thin Weiss Cert Cv$60 No ReserveDr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R33 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R24 5c Certificate Used No Reserve