Pocket Watch Database
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/3305/link
Access Date: December 23, 2024
"3305" 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: | 3305 | |
| Grade: | Series 14 | |
| Model: | 1921 | |
| Estimated Production Year: | 1923 | |
| Run Quantity: | 2,000 | |
| Grade/Model Run: | 2 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 Pat'd. '21 |
|
| Case: | Various | |
| Run ID: | 4.G2.10S3.101921M3.O4.P4.21J2 | |
| Database Version: | v52.518 | |
| 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 | 7 (0.35%) | |
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 7 watches in the population registry for this run with 1 image.
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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.
cmdraven 4083 · November 12, 2024
Serial Number 3844 was reported as accurate.
Anonymous · September 15, 2024
Serial Number 3002 was reported as accurate.
Anonymous · March 9, 2022
Serial Number 2534 was reported as accurate.
Anonymous · September 9, 2021
Serial Number 2325 was reported as accurate.
Anonymous · September 5, 2021
Serial Number 2325 was reported as accurate.
Anonymous · August 8, 2020
Serial Number 2399 was reported as accurate.
bunnofnickle 67 · July 12, 2020
Serial Number 2188 was reported as accurate.
Anonymous · April 9, 2020
Serial Number 3349 was reported as accurate.
okiejohn 397 · February 15, 2020
Serial Number 2522 was reported as accurate.
Anonymous · January 10, 2020
Serial Number 3872 was reported as accurate.
