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

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

Access Date: April 26, 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:	22.101G5.18S22.183M14.O22.L22.15J9
Database Version:	v52.245
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	0.177%
Registry Population:	4 (0.80%)

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Production Metrics Tree: Grade 101

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

Seth Thomas Grade 101 (All Variations): 3,200 ETP
18S: 3,200 100.00% 18s, Grade 101
18S-M3: 2,500 78.13% 18s, Grade 101, Model 3	Other: 700 Other Models or Unclassified
18S-M3-15J: 2,500 78.13% 18s, Grade 101, Model 3, 15 Jewels
18S-M3-15J-OGL: 2,500 78.13% 18s, Grade 101, Model 3, 15 Jewels, Openface/Lever/Gilt
18S-M3-15J-OGL-A: 2,500 78.13%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 4 watches in the population registry for this run with 2 images. Create a FREE account or login to view the population registry and add your watch to the registry. Create a Free Account

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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 302 · 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.