Collecting
166 sites
http://varietyvista.com/
Variety Vista, created by James Wiles Ph.D., is a massive reference database featuring 130,000+ photos documenting over 9,000 coin die varieties including doubled dies, RPMs, and mintmark styles across U.S. coin denominations. The site offers free online e-books covering Lincoln cents, Jefferson nickels, Buffalo nickels, and more, making it an indispensable tool for serious numismatists and cherry-pickers.
https://greekcoinage.org/
The Online Greek Coinage project is an international scholarly initiative building a comprehensive typology and linked open data ecosystem for ancient Greek coinage, backed by the International Numismatic Council and European funding. Researchers and collectors will find catalogues, mint studies, bibliography resources, hoard data, and structured numismatic description standards all in one place.
http://dickjohnsonsdatabank.com/index.html
Dick Johnson's Databank is a comprehensive reference catalog of medals, coins, and tokens created by American artists, featuring artist biographies, auction records, catalog citations, and photos organized alphabetically. Built by D. Wayne Johnson and praised by the Curator Emeritus of the Museum of Fine Arts Boston, it serves as the definitive scholarly resource for identifying and researching American medallic art.
http://ancientcoincollecting.blogspot.com/
Wayne G. Sayles, author and numismatist, maintains this long-running blog dedicated to ancient coin collecting and the ongoing debates surrounding cultural property rights. Posts cover topics ranging from coin authenticity and archaeology to legal battles over collectors' rights versus academic and governmental interests.
https://elgincoinclub.com/
The Elgin Coin Club is a numismatic collectors organization based in Elgin, Illinois, hosting monthly meetings, annual coin shows, auctions, and member bourse sales for hobbyists in the Chicago metro area. Maintained by communications chairman Michael Kahn, the site includes a newsletter index, membership information, club history, and resources covering coins, tokens, medals, paper money, and ancient coinage.
https://dendritics.com/scales/automated-calculations.asp
Dendritics offers interactive calculators for gemstone carat weight estimation, stone identification by specific gravity, and precious metal value in multiple currencies. Built by webmaster JB of Dendritics Inc., the site was recognized by Yahoo as an 'Incredibly Useful Site' and has served jewelers and gem enthusiasts since the late 1990s.