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 5 Pocket Watch

E. Howard Watch Co. (Keystone)

Grade: Series 5

Manufacturer: E. Howard Watch Co. (Keystone) Question Mark
Manufacturer Location: Waltham, Massachusetts Question Mark
Movement Serial Number: 1005322 Question Mark
Grade: Series 5 Question Mark
Variation: Straight Bridge Jeweled Barrel Question Mark
Model: Bridge Question Mark
Estimated Production Year: 1903 Question Mark
Run Quantity: 400 Question Mark
Grade/Model Run: 1 of 1 Question Mark
Grade/Model Total Production: 400 Question Mark
Size: 16s Question Mark
Jewels: 23j Question Mark
Jewel Material: Ruby & Sapphire Question Mark
Jewel Setting: Raised Gold Settings (Screw-Set) Question Mark
Movement Configuration: Openface Question Mark
Movement Finish: Nickel Question Mark
Finish Pattern: Paralell Question Mark
Movement Setting: Pendant Question Mark
Plate: Bridge Plate Question Mark
Double Roller: Yes Question Mark
Regulator: Reed Question Mark
Hairspring: Breguet Question Mark
Pallet Jewel Material: Sapphire Question Mark
Standard Dial Type: Double-Sunk Question Mark
Adjusted: Yes Question Mark
Adjusted to Position: Yes Question Mark
Adjusted # of Positions: 5 Question Mark
Adjusted to Temperature: Yes Question Mark
Adjusted to Isochronism: Yes Question Mark
Railroad Grade: Yes Question Mark
Movement Markings: E. Howard Watch Co.
Boston U.S.A.
Adjusted
23 Jewels
Case: Various Question Mark
Run ID: 143.G6.16S109.M3.O83.P118.23J11 Question Mark
Database Version: v52.560 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
1.20 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
4.13 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
0.076% Question Mark
Registry Population:
Scoped for This Run Only
1 (0.25%) Question Mark
Research Note: No Series Markings

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.


Anonymous · July 29, 2024

Serial Number 1005181 was reported as inaccurate.

Note: 23 Jewel Series 0 E Howard (made by Waltham,
Bridge Model) pendant set
Changes since this report was submitted:
Factory Model changed from 1907 to Bridge
Movement Setting changed from Lever to Pendant
Jewels changed from 19j to 23j

Anonymous · March 4, 2023

Serial Number 1005457 was reported as inaccurate.

Note: This serial number 1005457 is Lever set.
Curator Response: [Expert-Verified]
Changes since this report was submitted:
Jewels changed from 19j to 23j
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

Kurlander Supporter 25 · October 21, 2022

Serial Number 1005202 was reported as inaccurate.

Note: movement is stamped "23 Jewels" and the database
indicates "19 Jewels,"
Curator Response: Thanks for the report. If possible, please upload an image of the movement to your collection for further evaluation and documentation.
Changes since this report was submitted:
Jewels changed from 19j to 23j
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

Anonymous · August 29, 2022

Serial Number 1005260 was reported as inaccurate.

No further details were submitted with the report.
Changes since this report was submitted:
Jewels changed from 19j to 23j
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

Anonymous · January 8, 2022

Serial Number 1005235 was reported as inaccurate.

Note: The movement I'm hoping to buy is 19J not 23J
Curator Response: Thanks for the report. If possible, please upload an image of the movement to your collection for further evaluation and documentation.
Changes since this report was submitted:
Grade changed from Series 0 to Series 5
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

Anonymous · August 9, 2021

Serial Number 1005271 was reported as accurate.

Changes since this report was submitted:
Jewels changed from 19j to 23j
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

Anonymous · August 1, 2020

Serial Number 1005209 was reported as inaccurate.

Note: Movement shown on eBay is 19j.
Curator Response: Could you provide an item number or link for further evaluation?
Changes since this report was submitted:
Grade changed from Series 0 to Series 5
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes

MeGhost 3 · May 26, 2020

Serial Number 1005209 was reported as inaccurate.

Note: its a 19j not a 23j!
Curator Response: Thanks for the report. If possible, please upload an image of the movement to your collection for further evaluation and documentation.
Changes since this report was submitted:
Grade changed from Series 0 to Series 5
Factory Model changed from 1907 to Bridge
Railroad Grade changed from No to Yes
E. Howard Watch Co. (Keystone) Grade Series 5 Pocket Watch