Pocket Watch Database
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/39883
Access Date: April 24, 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
| Manufacturer: | E. Howard Watch Co. (Keystone) |  |
| Manufacturer Location: | Waltham, Massachusetts | |
| Movement Serial Number: | 39883 | |
| Grade: | Series 12 | |
| Model: | 1921 | |
| Estimated Production Year: | 1922 | |
| Run Quantity: | 4,000 | |
| Grade/Model Run: | 2 of 5 | |
| Grade/Model Total Production: | 47,450 | |
| Size: | 10s | |
| Jewels: | 17j | |
| Movement Configuration: | Openface | |
| Movement Finish: | Nickel | |
| Movement Setting: | Pendant | |
| Plate: | Bridge Plate | |
| Hairspring: | Breguet | |
| Adjusted: | Yes | |
| Adjusted to Position: | Yes | |
| Adjusted # of Positions: | 3 | |
| Adjusted to Temperature: | Yes | |
| Adjusted to Isochronism: | Yes | |
| Railroad Grade: | No | |
| Case: | Various | |
| Run ID: | 5.G2.10S5.101921M5.O5.P5.17J2 | |
| Database Version: | v52.245 | |
| 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 | 474.87 | |
| Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration | 9.183% | |
| Registry Population: | 5 (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 5 watches in the population registry for this run with 1 image.
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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.
Anonymous · May 14, 2022
Serial Number 39333 was reported as accurate.
Anonymous · May 19, 2021
Serial Number 42818 was reported as accurate.
Anonymous · May 6, 2021
Serial Number 39502 was reported as accurate.
Anonymous · March 30, 2021
Serial Number 39901 was reported as accurate.
Anonymous · March 9, 2021
Serial Number 42295 was reported as accurate.
Anonymous · January 9, 2021
Serial Number 41602 was reported as accurate.
Slirwin48 6 · December 30, 2020
Serial Number 40661 was reported as accurate.
lee571 Supporter 78 · December 12, 2020
Serial Number 42426 was reported as accurate.
lee571 Supporter 78 · October 7, 2020
Serial Number 41751 was reported as accurate.
Anonymous · August 23, 2020
Serial Number 39200 was reported as accurate.
Anonymous · August 1, 2020
Serial Number 41084 was reported as accurate.
Anonymous · July 10, 2020
Serial Number 41084 was reported as accurate.
oilseed Supporter 470 · January 16, 2020
Serial Number 42068 was reported as accurate.
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