The CollectorÕs Guide to U.S. Brewery Lithographed Tip Trays & Coasters is a great asset to both collectors and dealers in antique advertising. The guide contains over 460 different color examples of brewery tip trays / coasters with pricing information. In addition it identifies those trays by age, with pre-prohibition, prohibition era, and post prohibition identification. The book also details manufacturers, and gives a common grading scale.