About the Seth Thomas “No. 18” Clock
Title: Seth Thomas No. 18 Clock Model: A Collector’s Guide
The Seth Thomas No. 18 is an iconic mantel clock model that has graced homes since the late 19th century. This exquisite timepiece is a testament to the superior craftsmanship and innovative design principles of the renowned Seth Thomas Clock Company.
Typical case materials for the No. 18 include mahogany, walnut, cherry, and oak, with intricate wood marquetry adorning some editions. The clock boasts an elegant design, featuring a hooded case with ornate brass finials, a Roman numeral dial, and a classic pendulum swinging behind a glass panel.
Produced between 1875 and the early 20th century, the No. 18 is considered one of Seth Thomas’ most collectible models due to its enduring design, high-quality materials, and relative affordability compared to other antique clocks. Notable features include a striking brass movement, a coiled steel pendulum, and a weight-driven mechanism with a quarter hour strike on a bell.
The Seth Thomas No. 18 clock is not only a beautiful addition to any collection but also an intriguing study of American craftsmanship during the Victorian era. Its combination of aesthetic appeal, historical significance, and relative rarity make it a prized possession among antique clock enthusiasts.
Auction Records and Price History
The following 2 auction record(s) show actual sale prices for the Seth Thomas “No. 18” model clock. Prices vary based on condition, originality, and current market demand. Search for more records on AntiqueClocksPriceGuide.com.

Seth Thomas Oak No. 18 1 Wt. Clock
brass trim, weight and pendulum; partial label; with seconds bit; great case. (Dial has paint losses.) 53″
Sold: $2,600 | Date: July 27, 2011 | Source: Tom Harris Auctions

Mahogany Seth Thomas No. 18 Weight Driven Wall Clock
With a signed dial with seconds bit, brass trim, pendulum sand weight. Not tested. (The case has some minor scuffs.) 53″ Long
Sold: $2,400 | Date: Oct 05, 2013 | Source: Tom Harris