Pocket Watch Database
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/11816
Access Date: November 10, 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 15
| Manufacturer: | E. Howard Watch Co. (Keystone) |  |
| Manufacturer Location: | Waltham, Massachusetts | |
| Movement Serial Number: | 11816 | |
| Grade: | Series 15 | |
| Model: | 1921 | |
| Estimated Production Year: | 1924 | |
| Run Quantity: | 4,000 | |
| Grade/Model Run: | 1 of 2 | |
| Grade/Model Total Production: | 5,000 | |
| Size: | 10s | |
| Jewels: | 19j | |
| 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: | 5 | |
| Adjusted to Temperature: | Yes | |
| Adjusted to Isochronism: | Yes | |
| Railroad Grade: | No | |
| Movement Markings: | E. Howard Watch Co. Boston, U.S.A. [Triangle in Arrow] V Pat'd. '21 [Some Additionally Marked "19J"] |
|
| Case: | Various | |
| Run ID: | 7.G1.10S6.101921M6.O7.P7.19J1 | |
| Database Version: | v52.431 | |
| Advanced Metrics | ||
| PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration | 15.05 | |
| PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration | 52.86 | |
| Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration | 0.957% | |
| Registry Population: Scoped for This Run Only | 4 (0.10%) | |
Production Metrics Tree: Grade Series 15
Target Profile: 10S-M1921-19J-ONP-A5PTI
| E. Howard Watch Co. (Keystone) Grade Series 15 (All Variations): 5,000 ETP |
| 10S: 5,000 100.00% 10s, Grade Series 15 |
| 10S-M1921: 5,000 100.00% 10s, Grade Series 15, Model 1921 |
| 10S-M1921-19J: 5,000 100.00% 10s, Grade Series 15, Model 1921, 19 Jewels |
| 10S-M1921-19J-ONP: 5,000 100.00% 10s, Grade Series 15, Model 1921, 19 Jewels, Openface/Pendant/Nickel |
| 10S-M1921-19J-ONP-A5PTI: 5,000 100.00% |
Population Registry for This Run
| Image | Serial Number | Run Position | Primary Identification Method | Discovery Date | |
|---|---|---|---|---|---|
|
There are 4 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.
Louisc1 Supporter 86 · July 7, 2024
Serial Number 8811 was reported as accurate.
joelgetz Supporter 5 · November 9, 2023
Serial Number 11605 was reported as accurate.
Anonymous · March 28, 2023
Serial Number 11834 was reported as accurate.
Anonymous · October 2, 2022
Serial Number 10817 was reported as accurate.
Anonymous · February 28, 2022
Serial Number 11561 was reported as accurate.
Anonymous · September 9, 2021
Serial Number 8777 was reported as accurate.
Anonymous · May 10, 2021
Serial Number 9298 was reported as accurate.
Anonymous · October 8, 2020
Serial Number 11775 was reported as accurate.
Anonymous · August 13, 2020
Serial Number 10346 was reported as inaccurate.
ralph1 113 · July 15, 2020
Serial Number 9220 was reported as inaccurate.
serial# 9220
Boston. U.S.A
Pat'D 21
black triangle with a circle around it and an
arrow through circle
I will upload picture, hope this helps
Anonymous · June 18, 2020
Serial Number 9082 was reported as accurate.
Anonymous · June 18, 2020
Serial Number 9082 was reported as accurate.
Anonymous · June 13, 2020
Serial Number 11415 was reported as accurate.
Anonymous · June 13, 2020
Serial Number 11415 was reported as accurate.
Anonymous · June 11, 2020
Serial Number 11926 was reported as accurate.
Anonymous · April 30, 2020
Serial Number 10420 was reported as inaccurate.
Anonymous · January 22, 2020
Serial Number 10253 was reported as inaccurate.
Anonymous · December 30, 2019
Serial Number 8336 was reported as accurate.
Anonymous · December 24, 2019
Serial Number 8887 was reported as accurate.
Anonymous · May 20, 2019
Serial Number 9218 was reported as accurate.
Anonymous · February 27, 2019
Serial Number 8786 was reported as accurate.
