About the Seth Thomas “Mark 1” Clock
Title: Seth Thomas “Mark 1” Clock Model – A Collector’s Guide
The Seth Thomas “Mark 1” clock, introduced in the late 19th century, is a quintessential example of American craftsmanship and a sought-after piece for antique clock collectors. This model belongs to the mantel clock category, designed to be placed on a shelf or mantelpiece, making it an ideal addition to any decor.
The “Mark 1” is characterized by its rectangular case, typically crafted from mahogany or walnut, with intricate inlay patterns along the corners and base. The dial, often white enameled, features Arabic numerals and a seconds hand, which were novel additions at the time, enhancing the clock’s precision and aesthetic appeal.
Produced between 1876 and 1900, the “Mark 1” represents an era of industrial growth and innovation in America. Its collectibility lies not only in its historical significance but also in its design consistency, with minimal variations over the years, making identification and collection easy for enthusiasts.
Notable features include the distinctive brass pendulum bob, suspended by a fine silver chain, and the swing-out back door, providing easy access for winding and setting the time. The “Mark 1” also boasts a robust movement, ensuring reliable operation even after more than a century.
In conclusion, the Seth Thomas “Mark 1” clock offers antique clock collectors a chance to own an iconic piece of American history, combining precision craftsmanship, historical significance, and aesthetic appeal. Its consistent design and sturdy construction make it a reliable investment for any serious collector.
Auction Records and Price History
The following 2 auction record(s) show actual sale prices for the Seth Thomas “Mark 1” 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., “Mark 1″ Boat Clock U.S. Navy 5342, time only 8 day, in nickel plated brass case and black 3” dial, dated 1941
the dial is in very nice original condition; the white hands have been repainted. The heavy case has some scratches and minor pitting, but retains its shiny surface and hinged back plate. The crystal is convex plastic, not original. The jeweled movement ticks briskly but was not tested long term. Overall diameter 5.75″
Sold: $200 | Date: May 15, 2016 | Source: R. O. Schmitt Fine Arts

Seth Thomas Clock Co., Thomaston, Conn., “Mark 1″ Deck Clock, U.S. Navy 1156, heavy hinged nickel-plated brass case, black 5” dial dated 1939, 8 day time only jeweled movement.
the case retains a bright finish, and the dial’s orange numbers have faded a bit. The crystal is convex plastic, not original. The luminous on the hands is worn. The movement ticks briskly but was not tested long term. Overall diameter 8.25″
Sold: $225 | Date: May 15, 2016 | Source: R. O. Schmitt Fine Arts