When Numismatic Guaranty Corporation (NGC) was founded in 1987, it heralded the introduction of a new standard of integrity in coin grading. From the beginning, NGC has remained focused on grading collectible coins, tokens and medals accurately, consistently and impartially. As the company has grown to become the leading and largest third-party coin grading service, it has maintained a steadfast and uncompromising commitment to these ideals.
The knowledge, integrity and dedication of NGC's team of numismatic professionals ensure a level of grading consistency unparalleled among grading services. This record of consistency, built over the years, has helped to foster greater stability throughout the collectible coin marketplace.
NGC is the official grading service of the American Numismatic Association (ANA) and the Professional Numismatists Guild (PNG).
Founded in February 2001, Numismatic Conservation Services (NCS) is devoted to expert conservation of collectible coins, tokens and medals. NCS numismatic professionals have extensive experience in coin conservation techniques and are uniquely qualified to provide expert conservation services for coins of all metals, types and eras.
NCS conservation carefully removes surface contaminants such as PVC, soils, tarnish, carbon spots, verdigris and encrustation from coins. These conservation services are designed to preserve originality, improve eye appeal and provide long-term protection.
NCS is the conservation service of choice for the ANA and PNG.
In 2005, the founding of Paper Money Guaranty (PMG) established a new standard of integrity in the note-grading industry. Since then, PMG has been dedicated to upholding the highest standards of consistent and accurate grading. Today it is the world’s largest and most comprehensive third-party paper money grading service.
Thanks to proven processes, standards and expertise, PMG is proud to be the world’s most trusted and preferred paper money grading service.
PMG is the official paper money grading service of the ANA and PNG.
Founded in 2000, Certified Guaranty Company (CGC) is the world’s first independent and impartial third-party comic book grading service. CGC’s commitment to integrity, accuracy and consistency has made it the leader in its field. The grading standards developed by CGC for comic books, magazines, lobby cards and vintage photographs are widely accepted by collectors and dealers. Certification by CGC gives buyers and sellers greater confidence and has been instrumental to the growth of the hobby.
Classic Collectible Services (CCS) is the world's leading comic book pressing, restoration and restoration removal company. Formerly Classics Incorporated, the company was established as CCS in 2013 as part of its relocation to Sarasota, Florida. Its proven process has successfully enhanced the appearance and desirability of many collectible comic books over the years.
Authenticated Stamp Guaranty (ASG), a third-party authentication, grading and encapsulation service for collectible stamps, was started in 2017. ASG replicates many of the proven practices that have been developed by NGC, PMG and CGC.
A stamp determined to be genuine by ASG is graded according to a 100-point scale. It is then encapsulated with an attractive ASG certification label in a secure, high-quality holder. A proprietary system and extensive security measures tracks stamps at every stage of the grading process.
Collectibles Authentication Guaranty (CAG) provides comprehensive services for major collections, estates and museums as well as select artists. Collectors want to be completely confident in the authenticity and provenance of their collectibles. As an item passes through many different hands, however, its authenticity and provenance can become increasingly uncertain. CAG eliminates this uncertainty by working directly with collectors, estates, artists, museums and others to preserve the authenticity and provenance of collectibles, memorabilia and estate items at the source.