Pocket Watch Database
Access Date: November 29, 2022
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
|Manufacturer:||E. Howard Watch Co. (Keystone)|
|Manufacturer Location:||Waltham, Massachusetts|
|Movement Serial Number:||1231521|
|Estimated Production Year:||1913|
|Adjusted # of Positions:||3|
|Adjusted to Temperature:||Yes|
|Registry Population:||2 (0.03%)|
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 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:
Does this information describe your movement accurately?
Data Verification Reports
Bostonjoe Top Contributor Supporter 182 · December 17, 2021
Serial Number 1231521 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.
Anonymous · February 28, 2020
Serial Number 1235537 was reported as inaccurate.
Anonymous · February 17, 2020
Serial Number 1235537 was reported as accurate.
Nhkohn 1 · November 9, 2019
Serial Number 1231100 was reported as accurate.
Anonymous · July 3, 2019
Serial Number 1232962 was reported as accurate.
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