PCGS Professional Coin Grading Service Global standard for third-party coin authentication and grading. USA
NGC Numismatic Guaranty Company Independent grading for world coins with secure slab encapsulation. USA
ANACS American Numismatic Association Certification Service America’s oldest third-party coin grading service. USA
United States Mint Official COA (Commemoratives & Sets) Official mint issues with Certificate of Authenticity. USA
India Government Mint, Noida SPMCIL Unit • Official COA Government of India issues & proof/commemorative sets with COA. India
Reserve Bank of India (RBI) Monetary Authority • Museum & Outreach Authorizes currency issuance; houses the RBI Monetary Museum (study & provenance). India
British Numismatic Society (BNS) Scholarly Authentication & Research Academic body (since 1903) supporting numismatic research and expert attributions. UK
The Royal Mint (UK) Official COA • Commemoratives & Proof United Kingdom’s official mint; issues proof/commemoratives with COA. UK
