Seth Thomas Clock Company
Information from Wholesale, Retail, and Manufacturer’s Catalogs
Seth Thomas Clock Company Publications and Trade Documents
The publications presented in this section include Seth Thomas Clock Company catalogs, trade price lists, supplements, advertising material, and related historical documents dating primarily from the late nineteenth and early twentieth centuries. These materials provide important evidence regarding the marketing, distribution, pricing, and commercial presentation of Seth Thomas clocks and pocket watches.
Many surviving Seth Thomas factory records were destroyed during the catastrophic Connecticut flooding associated with Hurricanes Connie and Diane in August 1955. Because of this loss, original catalogs, trade circulars, retailer publications, and newspaper advertisements have become important surviving sources for reconstructing the production history and distribution networks of Seth Thomas products.
The documents presented in this section are intended to assist collectors, horologists, and researchers studying:
Seth Thomas pocket watch models,
private label watches,
named grades,
movement variations,
retailer distribution,
wholesale marketing,
and historical pricing information.
Several publications shown here contain illustrations and descriptions of Seth Thomas watches sold through wholesalers, jewelers, department stores, and mail-order retailers including Sears Roebuck, Montgomery Ward, J.M. Smyth, and other firms represented elsewhere within Seth Thomas Fan Space.
Historical Importance of Trade Publications
Original trade publications often preserve information no longer available in surviving factory records. Catalog engravings, price sheets, retailer supplements, and distribution circulars can help establish approximate manufacturing periods, identify private label relationships, and document historically important Seth Thomas variations that are rarely represented in modern reference books.
This material from the Seth Thomas Pocket Watch Mainsprings page re-presented below was extracted from the 1904 Seth Thomas Watch Material Catalog and that data was expanded upon by acquiring replacement mainsprings and catalogs manufactured by more than a dozen aftermarket manufacturers. This presentation demonstrates the ability to glean very valuable information from the 1904 Seth Thomas Watch Material Catalog and very effectively and materially expand upon it with additional research to rebuild the original dataset lost in the disastrous August 1955 flood that devastated the Seth Thomas factories in Connecticut.
Alternative Manufacturers of Mainsprings for Seth Thomas Pocket Watches
In addition to original Seth Thomas mainsprings, replacement mainsprings for Seth Thomas pocket watches were also offered by other manufacturers and material suppliers. The examples below document alternative manufacturers, package numbers, stated Seth Thomas applications, and any measurements printed on the original packaging. The metric units used on the packaging are confusing when trying to compare and cross-reference the mainsprings. For the purpose of clarity, the metric units used on the Mainspring Cross-Reference Chart below for the mainspring lengths have all been expressed in centimeters and the metric units used for mainspring width and thickness have all been expressed in millimeters regardless of how they were expressed on the packaging.
H R Alloy, Nu Vigor, and Sandsteel replacement mainspring packaging and catalogs identify Seth Thomas 16-size and 12-size applications using the same respective numbers, 2106 and 2521. These entries are listed as inferred Seth Thomas factory part numbers because they are not currently documented in surviving Seth Thomas material catalogs reviewed for this project.
| Manufacturer | Mfr. Part No. | ST Application | Factory Part No. | Length | Width | Thickness | Dennison | Details |
|---|---|---|---|---|---|---|---|---|
| Original Seth Thomas / 1904 Watch Material Catalog No. 650 | ||||||||
| Seth Thomas | 23 | Model 1 | 23 | 21.5 inches | .132 | .0075 | 24 wide, 3 thick | Mainspring with patent brace. |
| Seth Thomas | 140 | Model 2, Model 3, and Model 4 | 140 | 21.5 inches | .132 | .0075 | 24 wide, 3 thick | 1st QUALITY; with patent brace. |
| Seth Thomas | 141 | Model 2, Model 3, and Model 4 | 141 | 20 inches | .132 | .009 | 24 wide, 1¼ thick | 2nd QUALITY. |
| Seth Thomas | 339 | Model 5 | 339 | 21.5 inches | .132 | .0075 | 24 wide, 3 thick | With patent brace. Catalog note states movements Nos. 300,000 to 350,000 are 7 jewels and use the same mainspring, yoke, yoke screw, and setting arm as Model 6. |
| Seth Thomas | 436 | Model 5 High Grade Railroad Movements | 436 | 21.5 inches | .132 | .0075 | 24 wide, 3 thick | EXTRA QUALITY. |
| Seth Thomas | 536 | Model 6 and Model 7 Eagle Series Old Model | 536 | 20 inches | .132 | .009 | 24 wide, 1¼ thick | With patent brace. |
| Seth Thomas | 633 | Model 8 and Model 9 Eagle Series New Model | 633 | 20 inches | .116 | .009 | 20 wide, 1¼ thick | With patent brace. |
| Seth Thomas | 729 | Model 10 and Model 11 Century Old Model | 729 | 20 inches | .132 | .009 | 24 wide, 1¼ thick | With patent brace. |
| Seth Thomas | 828 | Model 12 and Model 13 Century New Model | 828 | 20 inches | .116 | .009 | 20 wide, 1¼ thick | With patent brace. |
| Seth Thomas | 927 | Model 14 | 927 | 17 inches | .076 | .0065 | 10 wide, 4½ thick | With patent brace. |
| Seth Thomas | 1026 | Model 15 | 1026 | 17 inches | .076 | .0075 | 10 wide, 3 thick | With patent brace. |
| Seth Thomas | 1026 | Model 16 | 1026 | 17 inches | .076 | .0075 | 10 wide, 3 thick | With patent brace. |
| Seth Thomas | 1026 | Model 17 | 1026 | 17 inches | .076 | .0075 | 10 wide, 3 thick | With patent brace. |
| Seth Thomas | 1119 | Model 18 | 1119 | 17 inches | .076 | .0075 | 10 wide, 3 thick | With patent brace. |
| Inferred Seth Thomas Factory Part Nos. from Alternate Manufacturers' Retail Packaging or Catalogs | ||||||||
| Seth Thomas | 536 | ST 18-size | 536 | not stated | 3.30 mm | 0.195 thick | 24 wide, 3 3/4 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 729 | ST 18-size | 729 | not stated | 3.30 mm | 0.225 thick | 24 wide, 1 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 828 | ST 18-size | 828 | not stated | 2.90 mm | 0.225 thick | 20 wide, 1 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 927 | ST 6-size | 927 | not stated | 1.90 mm | 0.16 thick | 10 wide, 6 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 1026 | ST 6-size | 1026 | not stated | 1.90 mm | 0.195 thick | 10 wide, 3 3/4 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 1441 | ST 0-size | 1441 | not stated | 1.50 mm | 0.15 thick | 6 wide, 7 thick | From 1944 Sandsteel Catalog No. 12 |
| Seth Thomas | 2106 | Model 21 | 2106 | 21 inches | 2.35 mm | 0.23 mm | 14 1/2 wide, 1 thick | 16-Size |
| Seth Thomas | 2521 | Model 22 or 23 | 2521 | 21 inches | 1.95 mm | 0.205 mm | 10 1/2 wide, 3 thick | 12-Size |
| Original Seth Thomas Package Example | ||||||||
| Seth Thomas | not stated | ST 12-size | not stated | not stated | not stated | not stated | not stated | .234 as marked on original package. |
| Alternative Manufacturers and Material Suppliers | ||||||||
| Black Shield | 4397 | ST 18-size No. 536 | No. 536 | 20 1/4 inches / 51.10 cm | 3.30 mm | 0.195 thick | 24 wide, 3 1/4 thick | Swartchild & Co., Chicago. |
| Black Shield | 4398 | ST 18-size No. 729 Century Wide | No. 729 | 20 1/4 inches / 51.10 cm | 3.30 mm | 0.225 thick | 24 wide, 1 1/2 thick | Swartchild & Co. Catalog No. 76 |
| Black Shield | 4399 | ST 18-size No. 828 Century Narrow | No. 828 | 20 1/4 inches / 51.10 cm | 2.90 mm | 0.225 thick | 20 wide, 1 1/2 thick | Swartchild & Co. Catalog No. 76 |
| Black Shield | 18978 | ST 16-size No. 2106 Centennial | No. 2106 | 20 inches / 50.25 cm | 2.40 mm | 0.23 thick | 15 wide, 1 thick | Swartchild & Co. Catalog No. 76 |
| Black Shield | 4399A | ST 12-size New Model | not stated | 20 1/2 inches / 52.00 cm | 2.00 mm | 0.20 thick | 11 wide, 3 1/2 thick | Swartchild & Co. Catalog No. 76 |
| Black Shield | 4400 | ST 6-size Century | No. 1026 | 14 inches / 35.50 cm | 1.90 mm | 0.195 thick | 10 wide, 3 3/4 thick | Swartchild & Co. Catalog No. 76 |
| Charles Robert | 701 | ST 18-size | No. 536 | not stated | 3.30 mm | 0.185 thick | 24 wide, 4½ thick | Swiss Made |
| Charles Robert | 705 | ST 12-size | not stated | not stated | not stated | 0.205 | not stated | Swiss Made |
| Charles Robert | 706 | ST 6-size | No. 1026 | not stated | 1.9mm | 0.205 thick | 10 wide, 3 thick | Swiss Made |
| Diamond | 76 | Model 1 | 23 | not stated | not stated | not stated | not stated | Benj. Allen & Co. |
| Diamond | 149 | Model 3 | 140 / 141 | not stated | not stated | not stated | not stated | Same as Diamond Part No. 76, Benj. Allen & Co. |
| Diamond | 220 | Model 2 | 140 / 141 | not stated | not stated | not stated | not stated | Same as Diamond Part No. 76, Benj. Allen & Co. |
| Diamond | 271 | Model 4 | 140 / 141 | not stated | not stated | not stated | not stated | Same as Diamond Part No. 76, Benj. Allen & Co. |
| E. & J. Swigart Co. | A 1175 | ST 18-size | No. 828 | not stated | 2.90 mm | 0.225 thick | 20 wide, 1½ thick | All Jewels |
| E. & J. Swigart Co. | 702 | ST 18-size | 18-size All Models | 20 1/2 inches | 3.30 mm | 0.22 thick | 24 wide, 2 thick | Illustrated Manual of American Watch Movements, SETH THOMAS and CENTURY |
| E. & J. Swigart Co. | 703 | ST 18-size | 18-size All Models | 20 1/2 inches | 2.90 mm | 0.22 thick | 24 wide, 2 thick | Illustrated Manual of American Watch Movements, SETH THOMAS and CENTURY |
| E. & J. Swigart Co. | 704 | ST 16-size | 16-size All Models | 18 1/2 inches | 2.40 mm | 0.23 thick | 15 wide, 1 thick | Illustrated Manual of American Watch Movements, SETH THOMAS and CENTURY |
| E. & J. Swigart Co. | 705 | ST 12-size | 12-size All Models | 16 1/2 inches | 2.00 mm | 0.21 thick | 11 wide, 3 thick | Illustrated Manual of American Watch Movements, SETH THOMAS and CENTURY |
| E. & J. Swigart Co. | 707 | ST 6-size | 6-size All Models | 14 1/2 inches | 1.90 mm | 0.15 thick | 10 wide, 7 thick | Illustrated Manual of American Watch Movements, SETH THOMAS and CENTURY |
| Etiquette Inc. | 520 | ST 18-size | No. 536 | 54.50 cm / 21½ inches | 3.30 mm | 0.19 thick | 24 wide, 4½ thick | Made by Gruen Watch Company in Switzerland |
| The Fulton | Wine Color | ST 18-size | not stated | not stated | not stated | 0.19 thick | not stated | No Retaining Clamp |
| HR Alloy | SA 652 | ST 18-size | No. 536 T Brace | 21½ inches | 3.30 mm | 0.19 thick | 24 wide, 2 thick | No Retaining Clamp |
| HR Alloy | SA 653 | ST 18-size | No. 729 T Brace | 30 inches | 3.30 mm | 0.22 thick | 24 wide, 2 thick | By Hammel, Riglander & Co. of Generale Ressorts in Switzerland |
| HR Alloy | A 654 | ST 16-size | No. 2106 | 21 inches | 2.35 mm | 0.23 thick | 14 1/2 wide, 1 thick | Made in Switzerland. |
| HR Alloy | SA 655 | ST 12-size | No. 2521 | 21 inches | 1.95 mm | 0.205 thick | 10 1/2 wide, 3 thick | Made in Switzerland. |
| KBK | 3033 | ST 16-size T end | not stated | not stated | 2.34 mm | 0.22 thick | 15 wide, 2 thick | Kilb, Beck, Kuesel, Inc. |
| Marco | 1001 | ST 18-size New Style | No. 536 | 20 1/4 inches | not stated | not stated | 24 wide, 3 3/4 thick | not stated |
| Marco | 1002 | ST 18-size Century, wider Factory No. 729 | No. 729 | not stated | not stated | not stated | not stated | not stated |
| Marco | 1010 | ST 16-size | No. ___ | not stated | not stated | not stated | not stated | Made in Switzerland. |
| Marco | 1030 | ST 12-size T end | not stated | not stated | not stated | not stated | not stated | Made in Switzerland. |
| Nu Vigor | 1072 | ST 18-size | No. 141 | 53.34 cm / 21 inches | 3.30 mm | 0.22 thick | 24 wide, 2 thick | Made in Switzerland. |
| Nu Vigor | 1073 | ST 18-size | No. 536 | 53.98 cm / 21 1/4 inches | 3.30 mm | 0.195 thick | 24 wide, 3 3/4 thick, 21 1/4 long | Made in Switzerland. |
| Nu Vigor | 1074 | ST 18-size | No. 729 | 50.80 cm / 20 inches | 3.30 mm | 0.22 thick | 24 wide, 1 1/2 thick | Made in Switzerland. |
| Nu Vigor | 1075 | ST 18-size | No. 828 | 50.80 cm / 20 inches | 2.90 mm | 0.22 thick | 20 wide, 2 thick | Made in Switzerland. |
| Nu Vigor | 1076 | ST 16-size | No. 2106 | 53.34 cm / 21 inches | 2.40 mm | 0.22 thick | 14 1/2 wide, 2 thick | Nu Vigor Catalog |
| Nu Vigor | 1077 | ST 12-size | No. 2521 | 53.34 cm / 21 inches | 2.00 mm | 0.20 thick | 11 wide, 3 1/2 thick | Nu Vigor Catalog |
| Nu Vigor | 1078 | ST 6-size | No. 1026 | 36.20 cm / 14 1/4 inches | 1.90 mm | 0.195 thick | 10 wide, 3 3/4 thick | Nu Vigor Catalog |
| Sandsteel | 536 | ST 18-size | No. 536 | not stated | 3.30 mm | 0.195 thick | 24 wide, 3 3/4 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 729 | ST 18-size | No. 729 | not stated | 3.30 mm | 0.225 thick | 24 wide, 1 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 828 | ST 18-size | No. 828 | not stated | 2.90 mm | 0.225 thick | 20 wide, 1 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 927 | ST 6-size | No. 927 | not stated | 1.90 mm | 0.16 thick | 10 wide, 6 1/2 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 1026 | ST 6-size | No. 1026 | not stated | 1.90 mm | 0.195 thick | 10 wide, 3 3/4 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 1441 | ST 0-size | No. 1441 | not stated | 1.50 mm | 0.15 thick | 6 wide, 7 thick | From 1944 Sandsteel Catalog No. 12 |
| Sandsteel | 2106 | ST 16-size | No. 2106 | not stated | 2.40 mm | 0.22 thick | 15 wide, 2 thick | Made in U.S.A. by the Sandsteel Spring Division of Sandvik Steel, Inc. aka Watch-Motor Mainspring Co. Inc. New York |
| Sandsteel | 2521 | ST 12-size | No. 2521 | not stated | 2.00 mm | 0.20 thick | 11 wide, 3 1/2 thick | Made in U.S.A. by Watch-Motor Mainspring Co. Inc. New York |
| Unit Resilient | 1002 | ST 18-size Century | not stated | not stated | not stated | 0.22 thick | not stated | not stated |
| Unit Resilient | not stated | ST 6-size | not stated | not stated | not stated | 0.15 thick | not stated | Made by Waltham Watch Company Waltham, USA |
| U.S.R. | not stated | ST 18-size Old Style | No. 23 | not stated | not stated | not stated | not stated | By Ulysse Sandoz-Robert of La Chaux-de-Fonds, Switzerland |
| U.S.R. | not stated | ST 18-size No. 536 | No. 536 | not stated | not stated | not stated | not stated | not stated |
| U.S.R. | not stated | ST 18-size No. 828 Century New Model | No. 828 | not stated | not stated | not stated | not stated | Photos contributed by Seth R. Thomas III |
| U.S.R. | not stated | ST 12-size | not stated | not stated | not stated | not stated | not stated | not stated |