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

E. Howard Watch Co. (Keystone)

Grade: Series 12

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 45479
Grade: Series 12
Model: 1921
Estimated Production Year: 1922
Run Quantity: 4,000
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
Case: Various
Registry Population: 3 (0.08%)
Database Version: v49.391

Production Metrics Tree: Grade Series 12

Target Profile: 10S-M1921-17J-ONP-A3PTI

E. Howard Watch Co. (Keystone) Grade Series 12 (All Variations): 47,450 ETP
10S: 47,450 100.00%
10s, Grade Series 12
10S-M1921: 47,450 100.00%
10s, Grade Series 12, Model 1921
10S-M1921-17J: 47,450 100.00%
10s, Grade Series 12, Model 1921, 17 Jewels
10S-M1921-17J-ONP: 47,450 100.00%
10s, Grade Series 12, Model 1921, 17 Jewels, Openface/Pendant/Nickel
10S-M1921-17J-ONP-A3PTI: 47,450 100.00%

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1 44303 #303 Collection November 13, 2022
2 44604 #604 Collection March 31, 2019
3 45479 #1479 Collection September 17, 2015
Standard Deviation of Known Examples: 610.90 (Expected: 1,154.84, Δ543.94/13.60%)

Help Us Help Others By Improving the Database:

Does this information describe your movement accurately?

Data Verification Reports

44001
Verification Serial Map
48000

Anonymous · May 18, 2022

Serial Number 47394 was reported as accurate.

Anonymous · January 12, 2021

Serial Number 47171 was reported as accurate.

MoatsJustin1 2533 · December 31, 2020

Serial Number 46413 was reported as accurate.

Anonymous · July 10, 2020

Serial Number 45828 was reported as accurate.

dafob4watch 1 · July 9, 2020

Serial Number 47663 was reported as accurate.

Anonymous · March 22, 2019

Serial Number 44207 was reported as accurate.

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