Seth Thomas Pocket Watch Models 21, 22, 24
6-SIZE PENDANT SET MODEL No. 24
12-SIZE PENDANT SET MODEL No. 22
16-SIZE PENDANT SET MODEL No. 21
Seth Thomas Centennial Series is represented in the Ehrhardt American Numbered Drawings as Model 21 EA 815 (left), Model 22 EA 816 (center), and Model 24 EA 822 (right); and can be identified through the use of the drawings below:
On September 1st of 1913 the Seth Thomas Clock Company released its Catalog No. 701 “Seth Thomas Watch Movements”. Catalog No. 701 was also marked as the “Centennial Edition” Trade Price List.
Within the 1913 Centennial Edition Trade Price List Seth Thomas introduced “Seth Thomas ‘Centennial’ Open-Face Watches”, 7-jewel high grade movements in three sizes. All of the movements were pendant set, utilized the Breguet hairspring, and came cased and timed from the factory.
Seth Thomas Model 21 Movement Markings
From serial number 1304501 the movement serial number is located on the right-hand side perimeter of the top plate. Serial number 1353394 is the highest serial number utilizing this marking format for which photographic documentation is available on Page 3 of the Seth Thomas Model 21 Image Gallery of the Pocket Watch Database.
Movement Marking Style 1 - Documented serial number range 1305200 - 1353394.
When production of Model 21 resumed in a higher serial number range the movement markings did not include the Centennial grade name. The significance of this omission is the subject of debate.
Movement Marking Style 2 - Documented serial number range 2593001 - 2600000.
You can support and assist our Seth Thomas Fan Space Research Project by uploading photographs of your Seth Thomas pocket watches to the Pocket Watch Database. Pocket Watch Database accounts are free of charge, and you will have full access to the photographs and descriptive information that you share, and you will have the ability to edit, change, or delete the information and photographs that you submit as you see fit.
Seth Thomas Model 22 Movement Markings
From serial number 3258701 the movement serial number is located on the right-hand side perimeter of the top plate. Serial number 3297387 is the highest serial number utilizing this marking format for which photographic documentation is available on Page 2 of the Seth Thomas 12-Size Image Gallery of the Pocket Watch Database.
Movement Marking Style 1 - Documented serial number range 3258786 - 3297387.
The first documented serial number with these movement markings is 3260459. The movement serial number is located on the left-hand side perimeter of the top plate, Safety Pinion is marked beneath the center wheel pivot, the signature is an upward curved Seth Thomas with Thomaston on a straight line below that and Conn. USA on a third line. Serial number 3266182 is the highest serial number utilizing this marking format for which photographic documentation is available.
Movement Marking Style 2 - Documented serial number range 3260461 - 3266182.
The only documented serial number with these movement markings is 3290543. The movement serial number is located on the right-hand side perimeter of the top plate, Safety in marked above the center wheel pivot and Pinion is marked beneath the center wheel pivot. The signature is an upward curved Seth Thomas with Thomaston Conn. USA in a slight upward curve below it. Serial number 3290543 is the only serial number utilizing this marking format for which photographic documentation is available.
Movement Marking Style 3 - Documented serial number 3290543.
Seth Thomas Model 24 Movement Markings
From serial number 3053263 the movement serial number is located on the left-hand side perimeter of the top plate. Serial number 3085304 is the highest serial number utilizing this marking format for which photographic documentation is available on Page 4 of the Seth Thomas 6-size Movements Manufactured Starting in 1910 Image Gallery of the Pocket Watch Database.
Movement Marking Style 1 - Documented serial number range 3053263 - 3085304.
Somewhere between Serial Number 3069401 and Serial Number 3081462 Model 24 some movements included the Centennial grade name being marked despite Style 1 markings also being used until at least Serial Number 3085304.
Movement Marking Style 3 - Documented serial number range 3081248 - 3102173.
From serial number 3055252 the Safety Pinion marking is removed. Serial number 3055493 is the highest serial number utilizing this marking format for which photographic documentation is available on Page 4 of the Seth Thomas 6-size Movements Manufactured Starting in 1910 Image Gallery of the Pocket Watch Database.
Movement Marking Style 2 - Documented serial number range 3055252 - 3055493.
Somewhere between Serial Number 3081658 and Serial Number 3082340 Model 24 some movements dropped the Centennial grade marking.
Movement Marking Style 4 - Documented serial number 3082340.
Somewhere between Serial Number 3082340 and Serial Number 3089566 the Model 24 signature was changed from two lines to three lines.
Movement Marking Style 5 - Documented serial number range 3089566 - 3091193.
You can support and assist our Seth Thomas Fan Space Research Project by uploading photographs of your Seth Thomas pocket watches to the Pocket Watch Database. Pocket Watch Database accounts are free of charge, and you will have full access to the photographs and descriptive information that you share, and you will have the ability to edit, change, or delete the information and photographs that you submit as you see fit.
Select Illustrated Grades within the Centennial Series
Seth Thomas Grade 320
7 Jewel - Model 24
This 1914 Seth Thomas 6-size open-face Model 24 pocket watch was manufactured with a nickel finished 3/4 plate, 7 jewels, and it is non-adjusted. The movement is stem wound and pendant, with a Breguet hair spring, and plain/simple regulator. Its serial number is 3063283, and its grade is Seth Thomas numbered grade 320. The private label movement is signed “Knickerbocker Watch Co. N.Y.”.
The movement presents with a private label “Knickerbocker Watch Co. N.Y.” Arabic dial with a hash marks minute track and red five-minute marginals; fitted with Seth Thomas #1271 blued spade hands 6-size. Knickerbocker Watch Co. is a private label in Seth Thomas Model 12, Model 13, Model 18, and Model 24.
The movement is cased in a 6-size open-face Illinois Watch Case Company gold-filled Supreme watch case with hinged back and bezel, serial number 1692438.
Seth Thomas Grade 322
15 Jewel - Model 24
This 1914 Seth Thomas 6-size open-face Model 24 pocket watch was manufactured with a nickel finished 3/4 plate, 15 jewels, and it is non-adjusted. The movement is stem wound and lever set, with a Breguet hair spring, and plain/simple regulator. Its serial number is 3052795, and its grade is Seth Thomas numbered grade 322. The private label movement is signed “LAKE SHORE”.
The movement presents with a 12-size private label LAKE SHORE 12X6 Arabic dial with a ring minute track and black five-minute marginals; fitted with Seth Thomas #1277 blued spade hands 12-size. The original private label "Lake Shore" 12X6 dial is missing. Lake Shore is a private label in Seth Thomas Model 5, Model 18, and Model 24 manufactured for Montgomery Ward & Co. by Seth Thomas and by Illinois Watch Co.
This is cased in a 12X6 Illinois Watch Case Company 20-years gold-filled "The Winner" hunting watch case, serial number 2466524.
Seth Thomas Grade 332
7 Jewel - Model 21
This 1914 Seth Thomas 6-size open-face Model 24 pocket watch was manufactured with a nickel finished 3/4 plate, 15 jewels, and it is non-adjusted. The movement is stem wound and lever set, with a Breguet hair spring, and plain/simple regulator. Its serial number is 3052795, and its grade is Seth Thomas numbered grade 322. The movement is signed “Seth Thomas Thomaston, Conn.”.
The movement presents with a 16-size Seth Thomas Arabic dial with hash mark minute track and red five-minute marginals, fitted with Seth Thomas spade & whip hands 16-size.
The movement is cased in a 16-size Illinois Watch Case Company 20-Year gold-filled open-face “The Winner” watch case with screw back and bezel, serial number 3016328.
Seth Thomas Grade 334
15 Jewel - Model 21
This 1914 Seth Thomas 6-size open-face Model 24 pocket watch was manufactured with a nickel finished 3/4 plate, 15 jewels, and it is non-adjusted. The movement is stem-wound and lever set, with a Breguet hair spring, and plain/simple regulator. Its serial number is 2598343, and its grade is Seth Thomas numbered grade 322. The movement is signed “Seth Thomas Thomaston, Conn.”.
The movement presents with a 16-size Seth Thomas Arabic dial with hash mark minute track and red five-minute marginals, fitted with Seth Thomas spade & whip hands 16-size.
The movement is cased in a 16-size Illinois Watch Case Company 20-Year gold-filled open-face watch case with screw back and bezel, serial number 2997355.