Characteristics of Seth Thomas Pocket Watch Models

Each of the twenty-four Seth Thomas pocket watch models represents a foundational mechanical standard that defines every movement built within that model family—from the simplest, non-adjusted 7-jewel version to the most advanced 23-jewel movement adjusted to six positions. These standards include core structural elements such as the type of top plate (full plate, 3/4 plate, divided 3/4 plate, or bridge plate) and the intended case orientation (hunting, open-face, or an adaptable configuration). Regardless of jewel count or grade, all movements of a given model share this structural DNA.

Serial number ranges serve as another key tool for identifying movements. The 1904 Seth Thomas Watch Material Catalog No. 650 provides a partial listing of serial number production blocks and their associated model numbers. That catalog—along with information from the Pocket Watch Database—forms the basis for the serial number ranges presented on the Seth Thomas Fan Space.

Production dates, however, is an area where the available sources diverge significantly. The estimated timelines published by Ehrhardt & Meggers in American Pocket Watches – Identification and Price Guide, Gilbert, Engle & Shugart in The Complete Price Guide to Watches (2012), and the data compiled by the Pocket Watch Database all differ from one another. By comparing these references, evaluating historical advertisements and catalog listings, and examining private-label examples, more accurate approximate production years have been developed and are provided here for each model.

This section is divided into three major areas—Model Specifications, Model Photo Albums, and Model Balance Bridge Engraving Patterns. Together, they describe the core structural standards that define each model, while also illustrating the variations that contribute to the different grades within that model. The photographic illustrations show mechanisms in various stages of disassembly, allowing readers to see the architecture of each model rather than relying solely on drawings or abstract descriptions. A small caution: the Model 14 photo album includes certain mechanical references traditionally described as “male” and “female” components—viewer discretion (and a sense of humor) is advised.