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 7 Pocket Watch

E. Howard Watch Co. (Keystone)

Grade: Series 7

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 1231521
Grade: Series 7
Model: 1912
Estimated Production Year: 1913
Run Quantity: 6,000
Total Production: 172,700
Size: 12s
Jewels: 17j
Movement Configuration: Openface
Movement Finish: Nickel
Movement Setting: Pendant
Plate: Bridge Plate
Double Roller: Yes
Hairspring: Breguet
Adjusted: Yes
Adjusted # of Positions: 3
Adjusted to Temperature: Yes
Railroad Grade: No
Case: Various
Registry Population: 2 (0.03%)
Database Version: v49.391

Production Metrics Tree: Grade Series 7

Target Profile: 12S-M1912-17J-ONP-A3PT

E. Howard Watch Co. (Keystone) Grade Series 7 (All Variations): 224,550 ETP
12S: 224,550 100.00%
12s, Grade Series 7
12S-M1912: 172,700 76.91%
12s, Grade Series 7, Model 1912
Other: 51,850
Other Models or Unclassified
12S-M1912-17J: 172,700 76.91%
12s, Grade Series 7, Model 1912, 17 Jewels
12S-M1912-17J-ONP: 172,700 76.91%
12s, Grade Series 7, Model 1912, 17 Jewels, Openface/Pendant/Nickel
12S-M1912-17J-ONP-A3PT: 172,700 76.91%

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1 1231521 #521 Collection September 16, 2020
2 1235033 #4033 Collection March 19, 2022
Standard Deviation of Known Examples: 2,483.36 (Expected: 1,732.20, Δ751.16/12.52%)

Help Us Help Others By Improving the Database:

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Data Verification Reports

1231001
Verification Serial Map
1237000

Anonymous · August 15, 2022

Serial Number 1234239 was reported as accurate.

Bostonjoe Top Contributor Supporter 182 · December 17, 2021

Serial Number 1231521 was reported as accurate.

Anonymous · May 29, 2021

Serial Number 1236010 was reported as accurate.

Automatic 254 · August 12, 2020

Serial Number 1236473 was reported as accurate.

Anonymous · June 19, 2020

Serial Number 1234762 was reported as accurate.

Changes since this report was submitted:
Grade changed from ? to Series 7

Anonymous · April 7, 2020

Serial Number 1235537 was reported as accurate.

Anonymous · February 28, 2020

Serial Number 1235537 was reported as inaccurate.

Note: PAT’D’12
17 jewels
TEMPERATURE
3 POS.
Curator Response: Thanks for the report. The database has been updated accordingly.
Changes since this report was submitted:
Grade changed from ? to Series 7

Anonymous · February 17, 2020

Serial Number 1235537 was reported as accurate.

Changes since this report was submitted:
Grade changed from ? to Series 7

Nhkohn 1 · November 9, 2019

Serial Number 1231100 was reported as accurate.

Changes since this report was submitted:
Grade changed from ? to Series 7

Anonymous · August 12, 2019

Serial Number 1236390 was reported as accurate.

Anonymous · July 3, 2019

Serial Number 1232962 was reported as accurate.

Changes since this report was submitted:
Grade changed from ? to Series 7

Anonymous · June 2, 2019

Serial Number 1236700 was reported as accurate.

Changes since this report was submitted:
Plate changed from 3/4 to Bridge
E. Howard Watch Co. (Keystone) Grade Series 7 Pocket Watch