The way the internet is used is changing. It used to be computers, now it's 2/3 cellphones. The way we store links is also changing to go along with the new technology. Rather than have to dig through a long list of bookmarks, just bookmark this article. I'll do my best to keep it updated. In the meantime, the most important sites will be listed here, ready when you need them.
Grading
PCGS Photograde
For US coins the process of determining the grade of your coins is as easy comparing what you have to the photos of they type of coin. If your coin is as well detailed as one grade shown but not as well detailed as the next better, your coin falls into the lower grade. This does not account for scratches, dings, excessive contact marks, damage, holes, or alterations which will dramatically affect value.
Value
What's it worth? To estimate value, you'll first need to estimate the grade.
Numismedia
I've found this site to be a fairly accurate representation of market values for US coins.
Die Varieties
Useful and abundant information on die varieties. Each offers advantages over the other. If you have a coin you suspect is a doubled die or has repunched mintmark you can compare your coin with known varieties.Doubled Die .com
John Wexler has forgotten more about die varieties than I will ever learn. His site expands well past Lincoln Cents and offers a library of articles explaining in detail various aspect of the coins he has studied and that you are looking for. Offers attribution service.Variety Vista
Variety Vista is the name of the website. It's common to refer to it as CONECA. Dr James Wiles operates the site as the home of the CONECA Master Listing of Die Varieties. Offers attribution service.SAN Database
Using the Standard Attribution Nomenclature developed on this blog, this is an ongoing project to document all die varieties for all US coins with photos, notes, linked cross references.*The next iteration of the database will become operational within a few weeks.
General Information
Error-Ref
Senior Editor: Mike Diamond.If there is a starting point, start here. Learn what sorts of errors are out there and how they happen. This site is akin to drinking water from a firehose. The sheer volume of information at your fingertips is astounding. Site has an effective and easy to use search feature. Take the time to read the whole site. Its long, kinda dry, but theres much to learn. You'll be able to tell the difference between a mint error and post mint damage at a glance.
Numista
Numista is a participative catalog of world coins, kinda like a wiki for world coins. There's a lot of information already in place to help you identify your coin, with more information added by users all the time.
CONECA Online
The home page for CONECA. CONECA is an acronym for Combined Organizations of Numismatic Error Collectors of America. I'm a member. You can be too.Cuds on Coins
Specializing on die chips, die breaks, and die cracks this site is continually developing. Updates are frequent. Readers are encouraged to submit their finds for attribution and gives the discoverer credit. This lets you make a direct contribution to the hobby. I've got a dime listed on the site.Trail Dies
Site dedicated to a particular style of anomaly.Maddieclashes.com
All things Die Clash.1 Million Pennies Project
A developing site exploring the entrepreneurial side of coin collecting, die varieties, and gets into the How-To of identifying errors and varieties. Specializes in Lincoln Cents with a developing Lincoln Cent Die Variety Cheat Sheet. Offers an Inspection Service and preparing to establish an attribution service for errors and die varieties.USACoinBook
Lots of information available for weights, measures, designer, mintage, some variety identification and a value guide (that needs to be taken with a grain of salt).Specialized Information
IndianVarieties.com
Great site for Flying Eagle Cents, Indian Cents, Early Cents
Coppercoins
If Lincoln Cents are your thing, this will be a GOTO site for you. Easy to use search engine by date/mintmark/variety.The Lincoln Cent Resource
Creator Brad Podraza brings a wealth of insight on Lincoln Cents. Articles, photos, links, all easy to access and a great place to learn.3 Cent Nickel
Specializing in...3 Cent Nickel. Also has some 2¢ die varieties listed.Seated Half Dimes
Steve Crain Seated Half Dimes on the Newman Numismatic PortalShieldNickels.Net
A treasure trove of information on the first nickelBrian's Variety Coins
Fantastic resource for nickel varieties.
JeffersonNickels.org
A guide to the Jefferson Nickel coin series
Seated Dime Varieties.com
Web-book resource for Liberty Seated Dime varietiesRichard’s Roosevelt Review
If you like Roosevelt Dimes, you'll like this.Double Dimes
The United States Twenty Cent Piece.SeatedLibertyHalfDollar.com
Wiley-Bugert
Capped Bust Half Dolla.org
Somewhat limited information on the 1807-1839 Capped Bust Half DollarsFranklinLover.com
For collectors of Franklin Half Dollars, errors and varieties.Trade Dollar Nut
Reference material for Trade DollarsVAM World
A site dedicated to errors and varieties on Morgan and Peace Dollars.The Ike Group
Reference material for Eisenhower Dollar enthusiasts.US Patterns
Canadian Coinage
Coins and Canada
All denominations of Canadian coinage. Includes major varieties, grading standards, values.Vickie Cents
Articles of interest for Canadian Large Cent collectors.World Coinage
Numista
120,000+ world coins in the collaborative coin catalog, built and constantly enriched by the Numista community.
Coin Related
Token Catalog
Reference site for tokensCurrency
MyCurrencyCollection.com
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