Provenance and Auction results
acsearch
A useful auction archive for coins and banknotes. It also has a image recognition option. Just upload a picture of your coin, and acsearch will try to find a match from previous auctions. The site is free, but for prices and image search you must pay.
Coinarchives
Coinarchives is also a site where you can search past auctions, for information about price or in search of provenance. Great free option, with a very expensive paid option.
Auction Platforms
Sixbid
Online auction platform. Gives you an overview of current auctions.
Numisbids
Online auction platform. Gives you an overview of current auctions.
Biddr
Online auction platform. Gives you an overview of current auctions.
Identifying Ancient Coins
PELLA
PELLA is an innovative research tool aiming, among other things, to provide a comprehensive typology and catalogue of the coinages struck by the Macedonian kings of the Argead dynasty (c. 700–310 BC).
SELEUCID COINS ONLINE
A searchable catolog of Seleucid Coins from the American Numismatic Society.
Wildwinds
The WildWinds website has been created as a reference and attribution resource in the field of ancient numismatics.
Tesorillo
Identification Guide. Study of the late roman bronze coins, covering 250 types of reverses of the period A.D. 313 – 498 (RIC VII – X).
OCRE
Online Coins of the Roman Empire (OCRE) is a tool designed to help in the identification, cataloging, and research of the coinage of the Roman Empire.
Fake coins and fourrées
Collectible or Not? A Study of Ancient Coin Fourées
A great article by Tyler Rossi for Coinweek.
