Pocket Watch Database

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 10 Pocket Watch

E. Howard Watch Co. (Keystone)

Grade: Series 10

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 1170293
Grade: Series 10
Variation: Ser. 10
Model: 1907
Estimated Production Year: 1912
Run Quantity: 300
Grade/Model Run: 13 of 23
Grade/Model Total Production: 17,800
Variant Est. Production: 15,550 (16S-M1907-21J-ONL)
Size: 16s
Jewels: 21j
Movement Configuration: Openface
Movement Finish: Nickel
Finish Pattern: Parallel
Movement Inlay Color: Black
Movement Setting: Lever
Plate: Bridge Plate
Bridge Type: Center
Double Roller: Yes
Barrel: Going
Regulator: Reed
Hairspring: Breguet
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
Case: Various
Run ID: 254.G13.16S168.161907M74.O159.L42.21J34
Database Version: v52.335
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
53.59
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
178.08
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
3.445%
Registry Population: 4 (1.33%)
$ Estimated Value (12 Month Change): 18.90% Analyzing 171 Sales

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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.


Fifty50 Supporter 325 · April 6, 2024

Serial Number 1170068 was reported as accurate.

Anonymous · August 9, 2020

Serial Number 1170012 was reported as inaccurate.

Note: E Howard was in Boston, Mass., not Waltham.
Curator Response: Thanks for the report. However, it is incorrect. While the movements are marked "Boston," the company was operated out of the old factory used by the U.S. Watch Company in Waltham, Massachusetts.
Changes since this report was submitted:
Movement Setting changed from Mixed to Lever
Railroad Grade changed from No to Yes

Anonymous · February 18, 2019

Serial Number 1170049 was reported as accurate.

Anonymous · November 14, 2018

Serial Number 1170098 was reported as accurate.

E. Howard Watch Co. (Keystone) Grade Series 10 Pocket Watch