How can you find provenance for your ancient coins? It helps to get good at recognizing dies and die matches and knowing what your coins look like. Brute Force: flipping through large numbers of books and catalogs in paper and electronic libraries. I haven't tried this unless I was just looking for an image of a coin with a known auction listing. Example: https://www.sullacoins.com/post/coins-of-parthian-king-phraates-iv Two sources for auction catalogs: RNumis a free online resource for provenance research (mostly Greek coin focused) The Newman Numismatic Portal located at Washington University in St. Louis a free resource for numismatic research and reference material (more US Coin focused) Roman Republican coins - the Schaeffer Roman Republican Die Project is a useful resource http://numismatics.org/archives/ark:/53695/schaefer.rrdp.b04. Examples: https://www.sullacoins.com/post/fun-provenance-find https://www.sullacoins.com/post/unencrypting-crawford-rrc Coins of Roman Egypt : Dattari Savio is an easy place to check with ~10K coins it provides one stop for 100+ years of provenance. Example: https://www.sullacoins.com/post/provenance-rediscovered Generally: ACSearch is pretty good - both image search and scanning entries (when you don't have a coin with 1000s of hits), however you will rarely find anything more than 20-25 years old unless the selling auction house lists older provenance. Example: https://www.sullacoins.com/post/the-temple-on-mt-eryx ACSearch helped me track down this coin to 1989: Here's funny story here of 5 previous owners found with image search (5 owners in about 30 months) https://www.sullacoins.com/post/who-s-bidding Specific Types: Die studies for your coin of interest are always a good place to look or for rarer coins the one reference article Example: https://www.sullacoins.com/post/ae-coin-from-ekkarra-achaea-phthiotis Image Searching: Having tried periodically http://ex-numis.com with no luck, even coins that I know have old provenance haven't turned up anything, I still hold out hope that this will be the best way to search provenance in the future, as databases grow and image matching technology improves. Post your coins with "restored provenance", or your favorite ways to add provenance, or anything else that you find interesting or entertaining.