Pocket Watch Database
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/5731
Access Date: December 22, 2024
"5731" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.
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 14
| Manufacturer: | E. Howard Watch Co. (Keystone) |  |
| Manufacturer Location: | Waltham, Massachusetts | |
| Movement Serial Number: | 5731 | |
| Grade: | Series 14 | |
| Model: | 1921 | |
| Estimated Production Year: | 1924 | |
| Run Quantity: | 3,000 | |
| Grade/Model Run: | 3 of 6 | |
| Grade/Model Total Production: | 8,400 | |
| Size: | 10s | |
| Jewels: | 21j | |
| Movement Configuration: | Openface | |
| Movement Finish: | Nickel | |
| Finish Pattern: | Wide Stripe | |
| Movement Setting: | Pendant | |
| Plate: | Bridge Plate | |
| Regulator: | Plain | |
| Hairspring: | Breguet | |
| Adjusted: | Yes | |
| Adjusted to Position: | Yes | |
| Adjusted # of Positions: | 5 | |
| Adjusted to Temperature: | Yes | |
| Adjusted to Isochronism: | Yes | |
| Railroad Grade: | No | |
| Movement Markings: | E. Howard Watch Co. Boston, U.S.A. [Star in Arrow] V [Some Additionally Marked "21J"] Pat'd. '21 |
|
| Case: | Various | |
| Run ID: | 6.G3.10S5.101921M5.O6.P6.21J3 | |
| Database Version: | v52.517 | |
| Advanced Metrics | ||
| PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration | 25.29 | |
| PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration | 88.88 | |
| Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration | 1.607% | |
| Registry Population: Scoped for This Run Only | 6 (0.20%) | |
Production Metrics Tree: Grade Series 14
Target Profile: 10S-M1921-21J-ONP-A5PTI
| E. Howard Watch Co. (Keystone) Grade Series 14 (All Variations): 8,400 ETP |
| 10S: 8,400 100.00% 10s, Grade Series 14 |
| 10S-M1921: 8,400 100.00% 10s, Grade Series 14, Model 1921 |
| 10S-M1921-21J: 8,400 100.00% 10s, Grade Series 14, Model 1921, 21 Jewels |
| 10S-M1921-21J-ONP: 8,400 100.00% 10s, Grade Series 14, Model 1921, 21 Jewels, Openface/Pendant/Nickel |
| 10S-M1921-21J-ONP-A5PTI: 8,400 100.00% |
Population Registry for This Run
| Image | Serial Number | Run Position | Primary Identification Method | Discovery Date | |
|---|---|---|---|---|---|
|
There are 6 watches in the population registry for this run with 2 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.
don1946 7 · May 16, 2024
Serial Number 7181 was reported as accurate.
Anonymous · July 26, 2023
Serial Number 6374 was reported as accurate.
Anonymous · July 4, 2022
Serial Number 7094 was reported as accurate.
JerryT Waltham Expert Small Watch Expert 425 · November 3, 2021
Serial Number 6569 was reported as accurate.
Anonymous · January 21, 2021
Serial Number 7243 was reported as accurate.
10mikemikes 25 · January 3, 2021
Serial Number 7716 was reported as accurate.
Anonymous · December 17, 2020
Serial Number 5952 was reported as accurate.
Anonymous · November 23, 2020
Serial Number 6937 was reported as accurate.
Anonymous · August 14, 2020
Serial Number 7415 was reported as accurate.
Anonymous · July 10, 2020
Serial Number 7243 was reported as accurate.
MJKauz Supporter 29 · July 3, 2020
Serial Number 5879 was reported as inaccurate.
Nov. 24, 1857
Anonymous · March 3, 2020
Serial Number 6268 was reported as inaccurate.
Anonymous · February 22, 2020
Serial Number 5175 was reported as inaccurate.
Anonymous · January 14, 2020
Serial Number 7556 was reported as accurate.
