About the Seth Thomas “Mark 1 Deck” Clock
Title: Seth Thomas “Mark 1 Deck” Clock Model: A Collector’s Guide
The Seth Thomas “Mark 1 Deck” clock is a classic mantel clock, crafted by one of America’s most revered clockmakers. This model was produced during the late 19th and early 20th centuries, spanning approximately from 1876 to 1934.
The “Mark 1 Deck” is characterized by its elegant and streamlined design, primarily constructed with walnut or mahogany case materials. The rectangular case is adorned with intricate inlays, brass accents, and a beveled glass front, contributing to its exquisite aesthetic appeal.
As a collectible, the Seth Thomas “Mark 1 Deck” clock stands out due to its superior craftsmanship, historical significance, and timeless design. The clock’s mechanical movement, with a pendulum swinging inside a glass-enclosed well, is a testament to the era’s precision engineering. Notable features include the Roman numeral dial, brass-bound wooden works, and a distinctive “Seth Thomas” signature on the face.
Moreover, the “Mark 1 Deck” offers collectors a chance to own a piece of American horological history. Its consistent quality and design evolution over the production period make it a popular choice among antique clock enthusiasts. The presence of various serial numbers on the back plate further allows for accurate dating and appreciation of specific model variations within this iconic line.
Auction Records and Price History
The following 1 auction record(s) show actual sale prices for the Seth Thomas “Mark 1 Deck” model clock. Prices vary based on condition, originality, and current market demand. Search for more records on AntiqueClocksPriceGuide.com.

C.1939, Seth Thomas, Mark 1 Deck clock with chrome case and black dial.
Condition: The case with some pitting where the chrome is gone; luminous hands now dark; the dial with US Naval markings, and serial number 1122, dated 1939. Runs OK.
Sold: $200 | Date: October 31, 2004 | Source: R.O. Schmitt Fine Arts