With more than 2400 marks illustrated and brief histories and cross-references of more than 1600 manufacturers, this is the most comprehensive reference source on the subject. To compile the information presented here, the authors devoted much time over several decades researching numerous sources. These include various editions of Trademarks of the Jewelry & Kindred Trades, U.S. Patent Office records, silver and jewelry catalogs of manufacturers, wholesalers and retailers, records of companies still in business, and pieces examined in antiques shops all over the country. This fourth edition includes many new trademarks, many additional companies, and brings up to date the many changes in company ownership during the last decade.