How can I contribute to the Numista catalogue?

There are several ways in which any member of Numista can help to improve and develop the catalogue:

• Add missing coins, banknotes, or exonumia items.
• Fill in empty fields, fix errors or improve the quality of the current information for items that are already in the catalogue.
• Record past auction sales.
• Suggest structural improvements to the catalogue admins through the forum. For example, the addition or improvement of currencies, mints, reference catalogues, ruling authorities, flags, signatures, banks, tags, engravers, or issuer descriptions.