Publications by Charles Terwilliger

Charles Terwilliger wrote extensively about horological subjects starting from at least 1953 up until the last Silent Auction catalogue in 1986. His credits include authoring multiple editions of the authoritative 400 Day Clock Repair Guide, editing of the beautiful exhibit of carriage clocks in A Century of Fine Carriage Clocks, and publishing the very rare The Horolovar Collection; A Comprehensive History and Catalogue of 400-Day Clocks (1880-1912). He additionally authored multiple National Association of Watch and Clock Collector (NAWCC) Bulletin articles and supplements, as well as various pamphlets, and inserts.

The Terwilliger Library

Horolovar 400-Day Clock Repair Guide

1984 – 9th Edition
Author: Charles Terwilliger
Editors: Robert Terwilliger, Gene Waggaman
Publisher: The Horolovar Company
ISBN: 0-916316-04-1
LCCN: 83-81592

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The Horolovar Collection

1962 – Limited Edition
Author: Charles Terwilliger
Description: A Comprehensive History and Catalogue of 400-Day Clocks (1880-1912). Picture Collection of 52 rare 400-Day clocks.

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Century of Fine Carriage Clocks

1987
Author: Joseph Fanelli
Editor: Charles Terwilliger
Publisher: Clock Trade Enterprises
ISBN: 9780916316044
LCCN: 82-7

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Clockmakers’ Buying Guide

1975 – Paperback
Author: Charles Terwilliger
Description: A Where To-Buy-It Service for Clock Repairmen
Publisher: Clock Trade Enterprises.
ISBN: 0-916316-02-5
LCCN: 75-31347

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NAWCC Bulletin

Various years
Multiple National Association of Watch and Clock Collectors (NAWCC) Bulletin articles, contributions and supplemental articles by Charles Terwilliger.

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Silent Auction Catalogs

1964-1987
Numerous catalogs with images and descriptions of items to be auctioned by silent bid, open only to members of the NAWCC.

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and more stuff

Various publications, inserts, ephemera – with his background in publishing, Charles Terwilliger understood the importance of advertising and the visual. Here are examples of items he had professionally printed.

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Charles O Terwilliger, Jr.

Charles Terwilliger’s contribution to horology can best be described as innovative and colorful. Not only did he revolutionize the accuracy of the 400-Day Clock, his research and clock reproductions continue to impact the world of clock collecting to this day.

HeroesofHorology.com was established in 2025 to honor the memory of Charles O Terwilliger, Jr and the company he established, Horolovar, and to fulfill the dream of his son, Robert Terwilliger, who wished for this biography to continue on after he himself passed away.