Pocket Watch Database
Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/870102
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/870102
Access Date: April 27, 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:
-Series2-16s-Model1905.jpg)
E. Howard Watch Co. (Keystone)
Grade: Series 2
| Manufacturer: | E. Howard Watch Co. (Keystone) |  |
| Manufacturer Location: | Waltham, Massachusetts | |
| Movement Serial Number: | 870102 | |
| Grade: | Series 2 | |
| Model: | 1905 | |
| Estimated Production Year: | 1905 | |
| Run Quantity: | 150 | |
| Grade/Model Run: | 4 of 11 | |
| Grade/Model Total Production: | 4,090 | |
| Variant Est. Production: | 150 (16S-M1905-15J) | |
| Size: | 16s | |
| Jewels: | 15j | |
| Jewel Material: | Ruby & Sapphire | |
| Jewel Setting: | Raised Gold Settings (Screw-Set) | |
| Movement Configuration: | Hunting | |
| Movement Finish: | Nickel | |
| Finish Pattern: | Parallel Bar (wide) | |
| Movement Setting: | Pendant | |
| Plate: | 3/4 Plate | |
| Regulator: | Reed | |
| Hairspring: | Breguet | |
| Pallet Jewel Material: | Sapphire | |
| Standard Dial Type: | Double-Sunk | |
| Adjusted: | Yes | |
| Adjusted to Position: | Yes | |
| Adjusted # of Positions: | 5 | |
| Adjusted to Temperature: | Yes | |
| Adjusted to Isochronism: | Yes | |
| Railroad Grade: | Yes | |
| Dial Feet Locations: | 10.7, 24.3, 48.9 | |
| U.S. Patents: | 781263, 796162, 886387, 900183, 992013, 971496, 978612, 981667 | |
| Case: | Various | |
| Run ID: | 26.G4.16S13.161905M13.H6.P24.15J1 | |
| Database Version: | v52.245 | |
| Advanced Metrics | ||
| PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration | 6.47 | |
| PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration | 21.42 | |
| Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration | 0.416% | |
| Registry Population: | 6 (4.00%) | |
|
Research Note: #870102: Verified with Wide Parallel Damskeening
|
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Production Metrics Tree: Grade Series 2
Target Profile: 16S-M1905-15J-HNP-A5PTI
| E. Howard Watch Co. (Keystone) Grade Series 2 (All Variations): 10,590 ETP | |||
| 16S: 10,590 100.00% 16s, Grade Series 2 |
|||
| 16S-M1905: 4,090 38.62% 16s, Grade Series 2, Model 1905 |
Other: 6,500
Other Models or Unclassified |
||
| 16S-M1905-15J: 150 1.42% 16s, Grade Series 2, Model 1905, 15 Jewels |
Other: 3,940
Other Jewels or Unclassified |
||
| 16S-M1905-15J-HNP: 150 1.42% 16s, Grade Series 2, Model 1905, 15 Jewels, Hunting/Pendant/Nickel |
|||
| 16S-M1905-15J-HNP-A5PTI: 150 1.42% | |||
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.
JerryT Waltham Expert Small Watch Expert 425 · June 9, 2021
Serial Number 870102 was reported as inaccurate.
Note: 15-jewel movement has single-roller escapement and
wide bar damaskeening.
wide bar damaskeening.
Changes since this report was submitted:
Double Roller changed from Yes to No
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