Watch reference books: The Camerer Cuss Book of Antique Watches, by T. P. Camerer Cuss, pub by Antique Collectors Club, 1976 (hardcover); The Complete Price Guide to Watches, 23rd edition, by Cocksey Shugart, Tom Engle and Richard E. Gilbert, pub by Cooksey Shugart Publications, 2003 (softcover); Wristwatches: A handbook and price guide, 4th edition, by Gisbert L. Brumer and Christia Pfeffer-Belli, pub by Shiffer Publications, 2004 (softcover). [3] £60-£80