One new Horolovar 400 Day Clock Repair Guide, 10th Edition, written by the late Charles Terwilliger, and edited by H.W. Ellison. Copyright 1991, Hardcover, 237 pages. ISBN: 0-916316-04-1 This is the latest edition, with 50 new back plate illustrations, other new material, and many other updates from the 9th edition. Known as the bible of anniversary clocks, this fascinating and comprehensive book is a must have reference for serious collectors, horologists, and indeed anyone with an interest in these beautiful timepieces. Divided into 18 sections, features include: The history of 400 day clocks Patent informaion Hundreds of photos of clocks and pendulums A detailed study of escapements Troubleshooting and repair tips Back plate illustrations to identify manufacturers and manufacture dates Technical specifications for mainsprings and suspension units Information linking manufacturers and importers Illustrated movement parts lists for major manufacturers Loads of interesting trivia (Click on one of the Store Categories links to the left to see our instruction booklets, other repair books, a full selection of Horolovar suspension spring sizes, complete Horolovar suspension spring units for all Kundo and Schatz clocks, mainsprings, winding keys, mainsprings, and many other anniversary clock related items.) We provide tracking for all shipments within the USA, and to those countries participating in e-DELCON service! And shipping within the USA is FREE!!!NOTE: International purchases do not include import duties, taxes, or charges and are not included in the item price or shipping cost. These charges are the buyers responsibility. Check with your country's customs office to determine what these additional costs will be prior to buying. We want you to be happy with our products and service. Please contact us if you have any questions or problems. We feel you've done your share for a successful transaction once you've paid for your purchase. Why should you have to wait until you've left positive feedback to the seller before receiving your feedback? We leave positive feedback when payment clears! We will usually ship within 1 business day of receiving cleared payment.