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The Model 22*
1913 to 1915
As late as 1910 there was no mention of a 12-size watch being made by Seth Thomas in any of the known catalogs, so it's interesting that the factory would design one so late in the game. The Model 22 debuted in 1913 with the Centennial Trade List, offered in just two jewel counts on nickel plates and available as a complete factory-cased watch only.
* This is an assigned model number
M22 Grade Assignment
There were only two known grades; both nickel-plated and open-face but with different jewel counts.
The 1915 Catalog Insert
Courtesy of the Smithsonian Museum of American History Library
The Centennial Grade
The Centennial Series was a named grade produced in three models, including the 12-size Model 22 family. While the standard Seth Thomas movements have two different jewel counts of 7 and 15, the Centennial grade always carried 7 jewels.
The 1913 Catalog Listing
The Model 23*
1913 Only
The Model 23 was the only known movement with a bridge design and was offered in four grades, including a 17-jewel Adjusted-3-Position with gold inlay on the plate engravings. It was apparently offered for the first time with the Model 22, and it's bizarre that the company would tool up to manufacture, not one, but two 12-size movements when their sales were slumping toward the end of watch production.
* This is an assigned model number
M23 Grade Assignment
Four grades were listed in the 1913 catalog and described in detail. The three higher grades came with ruby jewels in gold settings and a polished gilt gear train, and all four came with a micro-regulator.
The 1913 Catalog Listing
In the 1913 Centennial catalog the 21-jewel Maiden Lane was selling for $50, so the $25 price tag on the 17-jewel Adjusted-3-Position Grade 28 as a men's dress watch was considerable. These watches were available in "very thin special" cases.
Seth Thomas Highlights
The rarest regular-production two-tone pattern of all, made in one block of seventy - and then never again.