brownsrplm · June 29, 2025
Serial Number 957230 was reported as accurate.
Information Provided by PocketWatchDatabase.com:
https://new.pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/957703
https://new.pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/957703
Access Date: June 3, 2026
From the American Horology Archive:
E. Howard Watch Co. (Keystone)
Grade: Series 4
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.
As a result, the information may contain inaccuracies. Please let us know if you have details that can improve the database.
| Manufacturer: | E. Howard Watch Co. (Keystone) | ? |
| Manufacturer Location: | Waltham, Massachusetts | ? |
| Movement Serial Number: | 957703 | ? |
| Grade: | Series 4 | ? |
| Model: | 1905 | ? |
| Estimated Production Year: | 1908 | ? |
| Run Quantity: | 1,000 | ? |
| Grade/Model Run: | 15 of 25 | ? |
| Grade/Model Total Production: | 16,450 | ? |
| Variant Est. Production: | 7,420 (16S-M1905-O-P) | ? |
| Size: | 16s | ? |
| Jewels: | 17j | ? |
| Jewel Material: | Ruby & Sapphire | ? |
| Jewel Setting: | Gold Settings (Screw-Set) | ? |
| Movement Configuration: | Openface | ? |
| Movement Finish: | Nickel | ? |
| Finish Pattern: | Checkerboard | ? |
| Movement Setting: | Pendant | ? |
| Plate: | 3/4 Plate | ? |
| Double Roller: | Yes | ? |
| Regulator: | Reed | ? |
| Hairspring: | Breguet | ? |
| Pallet Jewel Material: | Sapphire | ? |
| Standard Dial Type: | Single-Sunk | ? |
| Adjusted: | Yes | ? |
| Adjusted to Position: | Yes | ? |
| Adjusted # of Positions: | 5 | ? |
| Adjusted to Temperature: | Yes | ? |
| Adjusted to Isochronism: | Yes | ? |
| Railroad Grade: | No | ? |
| Dial Feet Locations: | 10.7, 24.3, 48.9 | ? |
| Movement Markings: | E. Howard Watch Co. Boston U.S.A. Adjusted 17 Jewels Pat'd. '05 | ? |
| Case: | Various | ? |
| Run ID: | 91.G12.16S66.161905M60.O53.P80.17J64 | ? |
| Database Version: | v52.978 | ? |
| Advanced Metrics | ||
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| Registry Population: Scoped for This Run Only: | 29 (2.90%) | ? |
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Research Note: #957230: Reported as Lever-Set, #957662: Verified with features more consistent with Series 9 designation (gold meantime screws and brass balance screws).
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Continue Your Research
Population Registry for This Run
Total Known Population In Run 29/1,000
Percentage of Total Run 2.90%
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There are 29 watches in the population registry for this run with 3 images.
Create a FREE account or login to view the population registry and add your watch to the registry. |
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Why Might This Information Be Incorrect?
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Verification reports help confirm surviving examples and flag data that needs further research.
Verification Reports for this Run
The following reports have been submitted by members in reference to this production run. These reports help verify data and track inaccuracies that require further research.
Anonymous · February 26, 2021
Serial Number 957009 was reported as accurate.
Anonymous · February 17, 2021
Serial Number 957009 was reported as accurate.
Anonymous · February 2, 2021
Serial Number 957009 was reported as accurate.
Anonymous · August 4, 2020
Serial Number 957166 was reported as accurate.
Anonymous · April 27, 2020
Serial Number 957166 was reported as accurate.
Anonymous · March 29, 2020
Serial Number 957483 was reported as accurate.