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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Clubs & Associations

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#1 Used Red Grid Cancel Pair With Pf Certificate - 4 MarginsDrbobstamps Us Scott #142 Used Very Scarce Stamp With Pf CertificateCkstamps : Us Old Stamps Scott #85e 12c Z-grill 1868 Used 2014 Cv $2500 W/cert.Drbobstamps Us Scott #445 Mint Og Lh Very Scarce Line Pair With Pf CertificateMr Fancy Cancel 93 + 112 On Cover Henniker Nh Cds Docketed Sept 1869 Pf Cert Drbobstamps Us Scott #228 Gem Used Stamp With Graded Vf-xf 85 Pse CertificateCkstamps : Us Stamps Scott #67 5c Dark Buff 1861 Unused Rg Cv$27,500/og W/cert.Ckstamps : Us Old Stamps Scott #99 24c F-grill 1868 Unused Rg Cv$8500/og W/cert.Ckstamps : Us Stamps Scott #114a 3c No Grill 1869 Mint H/og Cv$10,000 W/cert.Noblespirit No Reserve Us 294-99 Mnh/lh 299 Margin Plate W/ Cert =$900 CvNoblespirit No Reserve Excellent Us 528b Gash On Cheek W/ Pf Cert =$300 Mint!O15 (depart Interior 1c) Block Of 12: Unused + 2014 Cert $900+ Sc.Us Scott 240-1893 50 Cent Columbian With Cert.mint/hinged/original Gum-see Disc.Us Stamp:#372 2c Carmine Hudson-ful​ton 1909 Mnh/og Stamp+certificate Xf-superbO110 (american Bank Note 6c) Block Of 6 Mnh O.g. + Cert $1,000+ Cat.J55 (5c Postage Due): Fresh Block Of 6 Unused Nh + Cert $960 Cat.Sb1 Stamps - Pretty 1868 5c Jefferson, F Grill W/2014 Weiss Cert.; Sc. 95; RgU.s. #72 Unused Beauty W/cert - 90c Blue ($1,300)Us #70 Used, Appears Mint, With Psag Cert Cv $300Noblespirit No Reserve Fantastic U.s. 7 Block Of 3 =$525 Cv W/ Pf Cert!Us Stamp:#213 2c Green American Bank Note Mnh/og Stamp + CertificateScott R7a 2 Cent Jumbo Blue Imperforate Certificate Revenue Stamp Value $17.50Dr Jim Stamps Old Us Revenue Scott R33d 10c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44c 25c Certificate Used No ReserveScott K11a 1919 24#10a With Pse Cert - Nice Pos 97r0 Cv$160.00#ltd Toy Stamp & 1989 Ted Williams Gold Hall Of Fame Stamp W Certificate#c4 Mint Original Gum Never Hinged With Pf Certificate VfDr Jim Stamps Old Us Revenue Scott R7c 2c Certificate Used $32.50 Cv No ReserveHawaii #66b No Period With Certificate "genuine"Dr Jim Stamps Old Us Revenue Scott R8c 2c Certificate Used $45 Cv No ReserveSb1 Stamps - Pretty 1893 6c Columbian Expo W/2010 Pf Cert.; Sc. 235; Vf/mnhDr Jim Stamps Old Us Revenue Scott R24d 5c Certificate Used No ReserveDr Jim Stamps Old Us Revenue Scott R44d 25c Certificate Used No ReserveExceptional Gem Scott #c18 Mint Og Nh - I Would Get A Graded Cert For This Us #800 Mint Og Nh Clean & Sound With Pse Cert Graded Xf-sup 95Dr Jim Stamps Old Us Revenue Scott R24c 5c Certificate Used No ReserveCkstamps : Us Old Stamps Scott #84 2c D-grill 1867 Used 2014 Cv$4500 W/cert.Dr Jim Stamps Old Us Revenue Scott R33c 10c Certificate Used Orange Cancel Nr1095, 3c Shipbuilding, Pse Graded Gem 100 Nh Certificate, Only 3 KnownDrbobstamps Us Scott #319f Mnh Stamp With Graded Pse CertificateUsa-bob-1862/1871-joined Pair Of 25c Certificate Revenues-usedGraded Xf-97, Og,. Nh. Gray, 1922, 15cent, Cat# 566, Cert #0000611, Bv-$175+Certificate Of Mailing - Kate Smith, Sheep And Clock (434)Dr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No ReserveSb1 Stamps - Pretty 1893 8c Columbian Expo W/2009 Pse Cert.; Sc. 236; Vf/mnhDr Jim Stamps Old Us Revenue Scott R44 25c Certificate Used No Reserve