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!


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Drbobstamps Us Scott #291 Sound Mint Og Lh Well Centered Stamp Pf CertificateUs Stamp:#459 2c Carmine 1914 Coil Imperf Mnh/og Single Stamp + CertificateNystamps Us Stamp # 369 Mint Og Nh $320 Bluish Paper Washington W/certNystamps Us Duck Stamp # Rw5 Mint Og Nh $475 W/certDrbobstamps 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 BlueCkstamps : Us Stamps Scott #243 $3 Columbian 1893 Mint H/og Cv$1600 W/aps Cert.Us Stamp:#431 8c Olive 1914-15 Mnh/og Stamp + Certificate Pse Xf90Us Stamp:#432 9c Salmon Red 1914-15 Mnh/og Stamp + Certificate PfUs Stamp:#427 4c Brown 1914-15 Slwm 10p. Mnh/og Stamp + Certificate Us Stamp:#454 2c Red Type Ii 1914-16 10p. Mnh/og Coil Stamp $150 + CertificateUs Stamp:#457 4c Brown 1914-16 Coil Perf. 10 Mnh/og Pair Stamp + Certificate Scott #78, 1863 24-cent Lilac. Nyfm Fancy Cancel. Pse Certificate; Cv=$350.Us#72 Used 90 Cent Pse Cert Cv $425.00Us Stamp:#416 10c Orange Yellow 1912-14. 12p. Mnh/og + Certificate Us Stamp:#418 15c Gray 1912-14. 12p. Mnh/og Stamp $190 + Certificate Us Stamp:#433 10c Orange Yellow 10p. Mnh/og Stamp + Certificate Pse Xf 90U.s. #526 Choice Mint Vf/xf Nh W/cert - 2c Carmine Rose ($57)Us Stamp:#424 1c Green 1914-15 10p. Mnh/og Stamp + Certificate Pse Xf Superb 95Us Stamp:#426 3c Violet 1914-15 Mnh/og Stamp + Certificate Pse Xf 90Us Stamp:#442 2c Carmine 1914 Flat Plate 10p. Coil Mnh/og +certificate Xf-sup95U.s. #503 Choice Mint Vf/xf Nh W/cert - 4c Brown, P11U.s. #606 Choice Mint Superb Nh W/cert - 2c Carmine, CoilHawaii 1859-63 Scott #16 W/certificate, Used "islani" Variety [id:8729]Sb1 Stamps - 1869 12c Adriatic Pictorial W/pf Cert & Weiss Verified Mnh; Sc. 117Us Stamp:#434 11c Dark Green 1914-15 Slwm 10p. Mnh/og Stamp + Certificate Nystamps Us Stamp # 156 Mint $225 W/certUs#291used Pse Cert Cv $210.00Us Stamp:#455 2c Carmine Type Iii 1914-16 10p. Mnh/og Coil Stamp + CertificateUs#291 Used Pse Cert Cv$210.00U.s. #508 Choice Mint Vf/xf Nh W/cert - 8c Olive Green, P11Us Stamp:#458 5c Blue 1914-6 Coil P.10 Mnh/og Stamp $150 + Certificate Us Stamp:#443 1c Green 1914 Flat Plate 10p. Mnh/og Stamp + Certificate#305, 6c Garfield, Xf-og-nh, With 2005 Pf Cert., Scott Is $150 - Rupp BrothersScott 387 1 Cent Coil Line Pair Forgery Made From 383 Pair ~ Weiss CertificateScott #215 Mint 1888 Carmine Jackson Certificate Cv $225.00U.s. #627-28 Choice Xf/sup Nh W/cert - 1926 2c - 5c IssuesScott #1013 Mint Nh 1952 Service Women Pse Slab Certificate Superb 98Us Stamp:#428 5c Blue 1914-15 Slwm 10p. Mnh/og Stamp + Certificate Scott #788 Mint Nh 1937 Army Pse Slab Certificate Xf-superb 95#1 Used Light Black Cancel With Pf CertificateScott #577 Mint Nh 1923 Washington Gem 100 Pse CertificateScott #1002 Mint Nh 1951 Chemicals Pse Slab Certificate Superb 98Scott #1017 Mint Nh 1953 National Guard Pse Slab Certificate Superb 98Scott #777 Mint Nh 1936 Rhode Island Pse Slab Certificate Xf-superb 95Scott #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 #940 Mint Nh 1946 Veterans Pse Slab Certificate Superb 98Nystamps Us Cut Square Stamp # Uy10 Mint $450 W/certPrincess Diana Stamps With Certificate Low Opening Bid Us #454 -- Coil Joint Line Pair--mint--with Pf Cert ( Cat Value $425)Us 3c Sc#232 Mnh +cert Cv $105Us #11 Margin Singles On Two Covers, One With Cert.Scott #1006 Mint Nh 1952 Rail Travel Pse Slab Certificate Superb 98Scott #957 Mint Nh 1948 Wisconsin Pse Slab Certificate Superb 98Scott #817 Mint Nh 1938 Taylor Pse Slab Certificate Xf-superb 95Us Stamp Scott:#92 - 1¢ Used Pen Blue Cancel Blue F Grill Certificate Included Nystamps Us Postage Due Stamp # J66 Used P#12 & Star Blue Cancel W/certPrincess Diana Stamps With Certificate Low Opening Bid