BPA Expertising Ltd
Website: http://bpaexpertising.com/
Tel: 01483 890199

The original aim was to provide collectors with the opinions of those whose daily work was the handling of stamps, and whose practical experience of the forgers’ and repairers’ devilry was, in consequence, inevitably superior even to the most knowledgeable amateur.

The Philatelic Foundation
Non-profit, specializes in United States stamps.
Website: http://www.philatelicfoundation.org/
Email: philatelicfoundation@verizon.net
Tel: (212) 221-6555


Professional Stamp Experts
Specializes in United States stamps, leading firm for grading
Website:http://www.psestamp.com/
Email: pse@collectors.com

Vincent Graves Greene Foundation
Canada's premier BNA expertizing service
Website: http://www.greenefoundation.ca/index.html
Email: vggfoundation@on.aibn.com

American Philatelic Expertizing Service
Expertizing arm of the American Philatelic Society
Website: http://www.stamps.org/Services/ser_AboutExpertizing.htm
Email: apsinfo@stamps.org
Tel: (814) 933-3803

Confederate Stamp Alliance
Expertizing arm of the Confederate Stamp Society
Website: http://www.csalliance.org/csa-4.htm
Email: csaas@knology.net

Hawaiian Philatelic Society
Expertizing Service
PO BOX 10115
Hoinolulu HI 96816-0115

Philatelic Stamp Authentication & Grading, Inc.
Website:http://www.stampauthentication.com
Email:info@stampauthentication.com
Tel: (305) 345-9864

Royal Philatelic Society Expert Committe
Website:rpsl.org.uk
Email: experts@rpsl.org.uk