Antique Seth Thomas “Regulator No. 1 Keyhole” Model Clock

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About the Seth Thomas “Regulator No. 1 Keyhole” Clock

Title: Seth Thomas “Regulator No. 1 Keyhole” Clock Model: A Collector’s Guide

The Seth Thomas “Regulator No. 1 Keyhole” clock, introduced in the late 19th century, is a quintessential representation of American craftsmanship and timekeeping excellence. This model belongs to the regulator category, designed primarily for scientific or industrial settings due to their high precision and pendulum-driven mechanism. However, its elegant design also made it suitable for homes, where it served as a mantel clock.

The Regulator No. 1 Keyhole’s case is typically crafted from mahogany, walnut, or cherry wood, showcasing the company’s commitment to using high-quality materials. The design is characterized by its rectangular shape and distinctive keyhole-shaped openings on either side of the dial, a feature that sets it apart from other models.

This clock model is highly collectible due to its historical significance, exceptional craftsmanship, and rarity. Produced between 1865 and the early 20th century, only a limited number have survived over time, making them valuable for antique clock enthusiasts. Notable features include a brass-faced dial with Arabic numerals, a long pendulum visible through an aperture, and a brass-bound mahogany case. Some versions may also feature an alarm function, further increasing their collector’s value.

In conclusion, the Seth Thomas “Regulator No. 1 Keyhole” clock is an essential addition to any antique clock collection, offering both historical and aesthetic appeal. Its unique design, high-quality materials, and rarity make it a desirable piece for connoisseurs of American horology.

Auction Records and Price History

The following 2 auction record(s) show actual sale prices for the Seth Thomas “Regulator No. 1 Keyhole” model clock. Prices vary based on condition, originality, and current market demand. Search for more records on AntiqueClocksPriceGuide.com.

Seth Thomas Clock Co., Thomaston, Conn., "Regulator No. 1 Keyhole" wall clock, 8 days, time only, brass weight driven movement in a mahogany case with painted metal dial and reverse painted tablet, c1915

Seth Thomas Clock Co., Thomaston, Conn., “Regulator No. 1 Keyhole” wall clock, 8 days, time only, brass weight driven movement in a mahogany case with painted metal dial and reverse painted tablet, c1915

the case retains its original finish with very minor veneer flaking on left side near rear and a case split repair at bottom of case. The dial and tablet are original and in good condition. Ht 34″

Sold: $3,400 | Date: October 26, 2014 | Source: R. O. Schmitt Fine Arts


Seth Thomas, Thomaston, Conn. "Regulator No. 1 Keyhole" wall clock with 8 day time only weight driven movement in mahogany case, c1915

Seth Thomas, Thomaston, Conn. “Regulator No. 1 Keyhole” wall clock with 8 day time only weight driven movement in mahogany case, c1915

the original finish has been rubbed and cleaned. The dial was properly repainted around 20 years ago, and with minor discoloration and chips. The original tablet is in good condition. This is a great example of a very rare clock; we have sold only 2 others in the last 31 years. Height 34 inches

Sold: $8,000 | Date: October 30, 2010 | Source: R. O. Schmitt Fine Arts