
Category: American Clock Mainsprings
Many American antique clocks had mainsprings that were too strong when they were new. For many years, the so called “standard” mainspring size was 3/4″ by .018″ by 96″, and new mainsprings of this size will cause wear to the mainwheel teeth. In this section I give examples of better mainsprings to use for new replacements. It is best to keep the original old mainsprings in some cases, and I give examples of this, too.


Gilbert “Pandia” Walnut Parlor Clock from 1885

Ansonia La Riviere Porcelain Mantel Clock, Visible Escapement

Seth Thomas Oak Kitchen Clock, July 1892

Gilbert Kitchen Clock Movement, 1908 with Picture Pendulum

New Haven Oak Drop Octagon Wall Clock

Seth Thomas “Metals No. 3” Oak Kitchen Clock

Ingraham “Colby” Oak Mantel Clock, 1924

Seth Thomas Adamantine Mantel Clock, Similar to Sussex

Ansonia Belmont Oak Kitchen Clock

Seth Thomas Mahogany Adamantine Mantel Clock

Seth Thomas Sentinel #1 Tambour Mantel Clock

Gilbert Maranville Calendar Clock

Ithaca No. 10 Farmer’s Double Dial Calendar Clock

Seth Thomas “Solna” Small Mantel Clock, 1940

Ingraham Wall Clock, Similar to the Ionic

Ingraham “Adrian” Black Mantel Clock, 1899

Ansonia Black Iron Mantel Clock with Visible Escapement

Plymouth (by Seth Thomas) Round Top Mantel Clock, 1940

Ingraham “Cosmo Duplex” Tambour Mantel Clock, 1926

Seth Thomas Tambour Mantel Clock with Quarter-Hour Strike, 1930s

Waterbury “Eton” Walnut Cased Wall Clock

“Plymouth” Tambour Mantel Clock by Seth Thomas, 1936

Seth Thomas Adamantine Mantel Clock, Mahogany and Green Marble

Seth Thomas Tambour Mantel Clock, No. 89 Movement, Thin Time Mainspring

Waterbury Oak Kitchen Clock with Steel Plate Movement

Seth Thomas Adamantine Mantel Clock, Arno, Black with Green Trim

Arthur Pequegnat Oak Mantel Clock, Made in Canada

Seth Thomas Medbury 5W Chiming Mantel Clock, 1951
