Swell...another fine example of why searching even the most common dates of coins can be an advantage for any level of collector. The example recently sold through the Legend Auction's Regency XX sales and is proof that good common dated material can make a tidy profit for any would be flipper. Check out how this all works and how you can take advantage!
The best resource available for varieties is the Cherrypicker's Guide to Rare Die Varieties. I have both volumes that covers all the types of coins. I'm thankful to have found this book and have fun finding valuable varieties that I sell and make lots of money on. If you're interested in purchasing a copy of this book, they are available here at a discount! http://amzn.to/1ZJ8zfZ
Beautiful Gold for Sale: http://amzn.to/1UM5eZd
Silver Bullion for Sale: http://amzn.to/1ZJ9tsP
Classic Coins for Sale: http://amzn.to/28vp0m1