Answers by Expert:
Small type U.S. coinage, die varieties, doubled dies, repunched mintmarks, and some limited error knowledge. I specialize in Lincoln cents, and know Jefferson Nickels, Roosevelt dimes, and Washington quarters reasonably well. I do not know anything about foreign coins, tokens, medals. Please DO NOT submit questions about coins other than U.S. coins - I will not be able to help with any other subject.
30 years working with Lincoln cents. I have written articles for various trade journals and periodicals, authored two books on the subject, and authored/developed www.coppercoins.com
American Numismatic Association, Numismatic Literary Guild, numerous local coin clubs.
Looking Through Lincoln Cents, author. Numismatic News, Coin World, Errorscope, CoinAge magazine.
American Numismatic Association Instructor