Pocket Watch Database
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/55603/movement
Access Date: August 21, 2024
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](https://pocketwatchdatabase.com/assets/images/models/Howard-1921-10s.jpg)
E. Howard Watch Co. (Keystone)
Grade: Series 12
Manufacturer: | E. Howard Watch Co. (Keystone) | ![]() |
Manufacturer Location: | Waltham, Massachusetts | ![]() |
Movement Serial Number: | 55603 | ![]() |
Grade: | Series 12 | ![]() |
Model: | 1921 | ![]() |
Estimated Production Year: | 1928 | ![]() |
Run Quantity: | 10,450 | ![]() |
Grade/Model Run: | 5 of 5 | ![]() |
Grade/Model Total Production: | 47,450 | ![]() |
Size: | 10s | ![]() |
Jewels: | 17j | ![]() |
Movement Configuration: | Openface | ![]() |
Movement Finish: | Nickel | ![]() |
Finish Pattern: | Standard Stripe | ![]() |
Movement Setting: | Pendant | ![]() |
Plate: | Bridge Plate | ![]() |
Regulator: | Plain | ![]() |
Hairspring: | Breguet | ![]() |
Adjusted: | Yes | ![]() |
Adjusted to Position: | Yes | ![]() |
Adjusted # of Positions: | 3 | ![]() |
Adjusted to Temperature: | Yes | ![]() |
Adjusted to Isochronism: | Yes | ![]() |
Railroad Grade: | No | ![]() |
Movement Markings: | E. Howard Watch Co. Boston, U.S.A. [Empty Circle in Arrow] 17J Pat'd. '21 [Some Additionally Marked "3 Pos. Temp"] |
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Case: | Various | ![]() |
Run ID: | 16.G5.10S15.101921M15.O16.P16.17J5 | ![]() |
Database Version: | v52.383 | ![]() |
Advanced Metrics | ||
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration | 142.86 | ![]() |
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration | 562.09 | ![]() |
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration | 8.346% | ![]() |
Registry Population: Scoped for This Run Only | 14 (0.13%) | ![]() |
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 | |
---|---|---|---|---|---|
There are 14 watches in the population registry for this run with 5 images.
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Help Us Help Others By Improving the Database:
Does this information describe your movement accurately?
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.
MIKEKTYLER Supporter 128 · November 24, 2022
Serial Number 61982 was reported as accurate.
Anonymous · May 12, 2022
Serial Number 57345 was reported as inaccurate.
cmdraven 4024 · December 7, 2021
Serial Number 53311 was reported as accurate.
Anonymous · July 27, 2021
Serial Number 55040 was reported as inaccurate.
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.
Cpmeadors Supporter 36 · June 23, 2021
Serial Number 57170 was reported as accurate.
Fifty50 Supporter 347 · April 21, 2021
Serial Number 59532 was reported as accurate.
Fifty50 Supporter 347 · April 21, 2021
Serial Number 59532 was reported as accurate.
Anonymous · September 27, 2020
Serial Number 58360 was reported as inaccurate.
PatrickFain 4 · September 19, 2020
Serial Number 60287 was reported as accurate.
Anonymous · April 1, 2020
Serial Number 56586 was reported as inaccurate.
tsalerno71 1 · February 1, 2020
Serial Number 55770 was reported as accurate.
Anonymous · January 24, 2020
Serial Number 57380 was reported as inaccurate.
LauraBishop 1 · May 4, 2019
Serial Number 59853 was reported as accurate.
![E. Howard Watch Co. (Keystone) Grade Series 12 Pocket Watch](https://pocketwatchdatabase.com/assets/images/models/Howard-1921-10s.jpg)
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