Donald De Carle was a Fellow of the British Horological Institute and also was a Medallist of the BHI. De Carle is considered by many horologists as the undisputed authority in watchmaking and watch repair.
One important thing to remember is when looking to purchase this book, one should make every attempt to locate an original publication which was printed by the NAG Press, Ltd., London. The original books have much better drawings and better details than the reproductions of 1992.
If one is interested in learning the watch repair trade or if you simply have an interest in how mechanical watches operate and function, this book is a must have. It is the "Bible" of watch repair.
This book also describes in detail the tools used in the trade and also provides detailed instruction on virtually every aspect of practical watch repair. This book also provides details on how to manufacture obsolete mechanical watch parts and the tools used to make them.
Good original copies are becomming scarce, but can usually be found a very reasonable prices. You would be very wise to purchase an original copy vs a new reproduction.
You simply can't go wrong owning this wonderful book on watch repair.