The comprehensive reference to U.S. Twenty-cent pieces. The culmination of 30 years of research on the series, this book is the comprehensive reference on the short-lived twenty-cent piece. With nearly 400 photographs, this highly-illustrated reference provides extensive coverage of varieties and every known die marriage, including die states, emission sequences, and rarity ratings. The book provides the collector with a wealth of new information never before published, and hopes to instill enthusiasm in new collectors. Other topics include the history of the series, patterns, a discussion on misplaced dates, collecting the series, grading, errors, exonumia, and survival estimates. A few interesting anecdotes round out the book with stories of discovery.