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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 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 evidently always carried 7 jewels.
Period Ad Cuts
1913
The Centennial catalog.
1915
The 1915 catalog insert pertaining to leftover Centennial stock, courtesy of the Smithsonian Museum of American History Library.
Seth Thomas Highlights
The rarest regular-production two-tone pattern of all, made in one block of seventy - and then never again.