This is the 1968 'Bestfit #111 Encyclopedia of Watch Material Part 1'. This very informative catalog has a wealth of information about watch movements and identifies them. It shows many brands and styles of watch movements, sorted by manufacturer and caliber with front and back views, and illustrations of each part with part number and name chart. There are special illustrated sections on Automatics, Calendars, Chronographs, Timers and more. This catalog also features a nice section on Hamilton watches in the back of the book. The book measures 8 1/2 by 11 inches. It has 555 pages+. The covers have some wear and minor creases. The spine and binding are strong and the pages are all intact with no tears. There is a phone number written in pencil on the front cover. This is definitely a 'must have' publication for anyone that repairs, collects or studies watches!