This book is a great overview of the anniversary clock, giving the owner of these clocks the information necessary to understand how to look after them and plenty of photographic illustrations.Their history, different variations and manufacturers are all breifly covered in the book. Following the instructions for getting your clock running again will require your full attention, but I now feel sufficiently knowledgable to attempt to get the right suspension spring, fit it and get my long standing defunct anniversary clock back into operation.