About the Seth Thomas “Regulator No. 10” Clock
Title: Seth Thomas “Regulator No. 10”: A Collector’s Delight
The Seth Thomas Regulator No. 10 is a renowned timekeeping masterpiece, belonging to the regulator family of clocks. Known for their precision and consistency in timekeeping, these clocks were designed primarily for scientific or industrial settings rather than homes. However, the aesthetic appeal of the Regulator No. 10 has made it a coveted addition to many antique clock collections.
The typical case materials used for the Seth Thomas Regulator No. 10 include mahogany, walnut, and pine. The design is characterized by a substantial weight, pendulum visible through a glass door, and a long, slender dial that extends beyond the case’s width. The overall appearance is sleek and minimalistic, with an emphasis on functionality over ornamentation.
Produced between the late 19th century and early 20th century, the Regulator No. 10 embodies the industrial era’s spirit of innovation and precision. Its collectibility stems from its rarity, as it was not mass-produced like some other Seth Thomas models. Notable features include the dial marked with seconds, minutes, and hours, the counterbalanced pendulum, and the adjustable beat error screw, which allows for fine-tuning of the clock’s accuracy.
The Seth Thomas Regulator No. 10 is not just a timekeeping device but a testament to American craftsmanship during the industrial revolution. Its combination of functionality, rarity, and historical significance makes it an attractive acquisition for antique clock collectors worldwide.
Auction Records and Price History
The following 2 auction record(s) show actual sale prices for the Seth Thomas “Regulator No. 10” model clock. Prices vary based on condition, originality, and current market demand. Search for more records on AntiqueClocksPriceGuide.com.

C.1889, Seth Thomas Clock Co., “Regulator No. 10”, in walnut with burled accents, 8-day, weight driven.
Condition: the case has been cleaned, especially at the extremities and some new polish applied; most of the finish is original, nicely waxed, one minor veneer repair below door. Otherwise this clock is in outstanding original condition, with good silvered dial, original hands, weight, pendulum, crank and wrench for the nuts that hold the movement in. Has an early nickel plated movement (looks black in foto, because it reflects like a mirror). This clock has been well cared for from the beginning. For full details on this model, see Tran Ly’s book on Seth Thomas, 3rd Edition, pages 287-289. Height 72 inches
Sold: $62,000 | Date: 11-08-2008 | Source: R. O. Schmitt Fine Arts

Seth Thomas Clock Co., Thomaston, Conn, “REGULATOR No. 10”, wall hanging jeweler’s regulator, 8 day, weight driven mov’t, w/ silvered dial, center sweep seconds hand and walnut case with burled appliques, from the collection of Bob Wasserman of Milanville, PA, c1886
Mr. Wasserman was one of the most discriminating collectors in the Eastern US, and this clock certainly reflects his desire for both quality and originality. Details on this model can be found in all editions of Tran Ly’s book titled “Seth Thomas Clocks and Movements”, with extra info in the 3rd Edition, pages 287–289. Clock retains original pulley, nickel plated weight with knurled ends and mercurial type pendulum with thumb-print jar; glass jar with small chips on top edge and one at bottom. Original silvered dial retains original matte finish, never re-silvered, and with some tarnish spots, especially near numeral “V”, and the reverse with original lacquer and brushed spotting. Using the earlier nickel plated movement of outstanding quality, this and the mov’t for the Regulator 12 are perhaps of the finest quality produced by Seth Thomas, jeweled pallets, maintaining power and fine beat adjustment. Note this case has been cleaned, and retains all is original light crazing to original finish, with all original trims and decorations. Outstanding original condition with inside label intact. Also original winding crank and door glass {wavy with imperfections}. Ly price guide is low and outdated on this model. Ht 72″
Sold: $69,000 | Date: October 29, 2011 | Source: R. O. Schmitt Fine Arts