Seth Thomas Pocket Watch: Serial Number 20640 (Grade 101)

Sell Your Watch Save to My Collection Print Page Find a Mainspring Find a Balance Staff

Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/seth-thomas/20640

Access Date: December 20, 2024

From the American Horology Archive:

Seth Thomas Watch Co.

Grade: 101

Manufacturer:	Seth Thomas
Manufacturer Location:	Thomaston, Connecticut
Movement Serial Number:	20640
Grade:	101
Model:	3
Estimated Production Year:	1887
Run Quantity:	500
Grade/Model Run:	3 of 6
Grade/Model Total Production:	2,500
Size:	18s
Jewels:	15j
Jewel Setting:	Screw-Set
Movement Configuration:	Openface
Movement Finish:	Gilt
Movement Setting:	Lever
Plate:	3/4 Plate
Balance Type:	Expansion
Regulator:	Reed
Hairspring:	Flat
Standard Dial Type:	Double-Sunk
Adjusted:	Yes
Movement Markings:	Seth Thomas Thomaston, Conn. Safety Pinion Adjusted
Case:	Various
Run ID:	24.101G5.18S24.183M14.O24.L24.15J9
Data Research:	1904 Seth Thomas Serial List
Database Version:	v52.516
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	7.52
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	21.78
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	0.180%
Registry Population: Scoped for This Run Only	5 (1.00%)

Value Guide

What is My Watch Worth?

Have a Question?

Ask the experts in The Pocket Watch Group

Production Metrics Tree: Grade 101

Target Profile: 18S-M3-15J-OGL-A

Seth Thomas Grade 101 (All Variations): 2,750 ETP
18S: 2,750 100.00% 18s, Grade 101
18S-M3: 2,500 90.91% 18s, Grade 101, Model 3	Other: 250 Other Models or Unclassified
18S-M3-15J: 2,500 90.91% 18s, Grade 101, Model 3, 15 Jewels
18S-M3-15J-OGL: 2,500 90.91% 18s, Grade 101, Model 3, 15 Jewels, Openface/Lever/Gilt
18S-M3-15J-OGL-A: 2,500 90.91%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 5 watches in the population registry for this run with 3 images. Create a FREE account or login to view the population registry and add your watch to the registry. Create a Free Account

Help Us Help Others By Improving the Database:

Does this information describe your movement accurately?

Yes

Why Might This Information Be Incorrect?

Verification Reports for this Run

The following reports have been graciously submitted by dedicated members in reference to this production run. These reports are useful to verify data and track inaccuracies that require further research. Please note that reports may contain inaccurate information or assumptions that must be dilligently considered with other available sources.

Anonymous · June 10, 2023

Serial Number 20581 was reported as accurate.

SethThomasFan Top Contributor Seth Thomas Expert Supporter 413 · January 28, 2023

Serial Number 20640 was reported as accurate.

Anonymous · December 8, 2021

Serial Number 20902 was reported as inaccurate.

Note: #20,902 is a 7 jewel watch

Curator Response: Thanks for the report. If possible, please upload an image of the movement to your collection for further evaluation and documentation.