Pocket Watch Database

Due to the lack of existing factory records, our E. Howard Watch Co. (Keystone) database has been reconstructed using observations of known watches.
As a result, the information may contain inaccuracies. Please let us know if you have details that can improve the database.

From the American Horology Archive:
E. Howard Watch Co. (Keystone) Grade Series 12 Pocket Watch Movement

E. Howard Watch Co. (Keystone)

Grade: Series 12

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 57170
Grade: Series 12
Model: 1921
Estimated Production Year: 1924
Run Quantity: 10,450
Total Production: 47,450
Size: 10s
Jewels: 17j
Movement Configuration: Openface
Movement Finish: Nickel
Movement Setting: Pendant
Plate: Bridge Plate
Hairspring: Breguet
Adjusted: Yes
Adjusted to Position: Yes
Adjusted # of Positions: 3
Adjusted to Temperature: Yes
Adjusted to Isochronism: Yes
Railroad Grade: No
Database Version: v46.977

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Data Verification Reports

53001
Verification Serial Map
63450

Anonymous · September 26, 2021

Serial Number 55656 was reported as accurate.

Anonymous · September 20, 2021

Serial Number 61786 was reported as accurate.

Anonymous · July 27, 2021

Serial Number 55040 was reported as inaccurate.

Note: I have SN: 55040: Series V, Gilt movement finish,
size L (16s), Key set and may be a conversion to
stem wind (no tang visible), Breguet H.S.,3/4 back
plate. Thank you. S.B.
Curator Response: Please conduct your serial lookup under the "E. Howard & Co." manufacturer instead of the Keystone Howard database. https://pocketwatchdatabase.com/search/result/e.-howard-co/55040

Cpmeadors Supporter 12 · June 23, 2021

Serial Number 57170 was reported as accurate.

Fifty50 Supporter 279 · April 21, 2021

Serial Number 59532 was reported as accurate.

Fifty50 Supporter 279 · April 21, 2021

Serial Number 59532 was reported as accurate.

Anonymous · April 21, 2021

Serial Number 58124 was reported as accurate.

Anonymous · September 27, 2020

Serial Number 58360 was reported as inaccurate.

No further details were submitted with the report.

PatrickFain 4 · September 19, 2020

Serial Number 60287 was reported as accurate.

Anonymous · August 9, 2020

Serial Number 59902 was reported as accurate.

Anonymous · June 20, 2020

Serial Number 56440 was reported as accurate.

Anonymous · May 30, 2020

Serial Number 57143 was reported as accurate.

Anonymous · May 13, 2020

Serial Number 56604 was reported as accurate.

Anonymous · April 1, 2020

Serial Number 56586 was reported as inaccurate.

No further details were submitted with the report.

Anonymous · March 29, 2020

Serial Number 58747 was reported as accurate.

Anonymous · March 3, 2020

Serial Number 60444 was reported as accurate.

tsalerno71 1 · February 1, 2020

Serial Number 55770 was reported as accurate.

Anonymous · January 29, 2020

Serial Number 62392 was reported as accurate.

Anonymous · January 24, 2020

Serial Number 57380 was reported as inaccurate.

No further details were submitted with the report.

LauraBishop 1 · May 4, 2019

Serial Number 59853 was reported as accurate.

Anonymous · May 4, 2019

Serial Number 59853 was reported as accurate.

Anonymous · April 13, 2019

Serial Number 62736 was reported as accurate.

E. Howard Watch Co. (Keystone) Grade Series 12 Pocket Watch Movement