The Horolovar 400-Day Clock Repair Guide

A practical workshop manual for repairing 400-day clocks, the torsion-pendulum mantel clocks under glass domes often called anniversary clocks. Charles Terwilliger covers how the escapement works, how to choose the correct suspension spring for hundreds of identified models, and how to assemble the suspension unit, with hundreds of detailed illustrations. Useful for clockmakers, repairers and collectors who want to service these clocks themselves.

The book has a dust jacket with chips and small tears along the top edge, a creased and torn section at the head of the back panel and fading on the spine. There is wear at the head and tail of the jacket spine, and there is foxing to the top edge of the pages. See photos