About the Seth Thomas “Unlisted No. 1” Clock
In this collector’s reference, we delve into the intricacies of the Seth Thomas “Unlisted No. 1” clock, a captivating piece from the early 20th century. Manufactured around 1900, this ADAMANTINE shelf clock is distinguished by its three columns on each side of the dial, adding to its allure and making it one of the more attractive models in the Seth Thomas collection.
The clock’s case remains in pristine condition, with only a minor wear spot visible in the cello veneer on the top left corner. The original hands continue to spin gracefully over the dial, while the dial itself has been replaced. Powering this timepiece is a good, signed St movement bearing the number 89AD. Standing at a height of 11.5 inches, this Seth Thomas “Unlisted No. 1” clock is an excellent addition to any vintage clock collection.
Auction Records and Price History
The following 1 auction record(s) show actual sale prices for the Seth Thomas “Unlisted No. 1” model clock. Prices vary based on condition, originality, and current market demand. Search for more records on AntiqueClocksPriceGuide.com.

Seth Thomas ADAMANTINE shelf clock, shown by Ly as “Unlisted No. 1”, one of the more attractive models with 3 columns on each side of the dial. C.1900.
the case is very clean with only one wear spot in the cello veneer, top left corner. The paper dial has been replaced. Hands are original. Good, signed St movement No. 89AD. Height 11.5 inches
Sold: $161 | Date: November 6, 2009 | Source: R. O. Schmitt Fine Arts