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 4 Pocket Watch Movement

E. Howard Watch Co. (Keystone)

Grade: Series 4

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 968423
Grade: Series 4
Model: 1905
Estimated Production Year: 1910
Run Quantity: 1,000
Total Production: 16,610
Size: 16s
Jewels: 17j
Jewel Material: Ruby & Sapphire
Jewel Setting: Gold Settings (Screw-Set)
Movement Configuration: Hunting
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: Double-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
U.S. Patents: 781263, 796162, 886387, 900183, 992013, 971496, 978612, 981667
Database Version: v48.141
Research Note: #968661: Verified with Narrow Parallel Pattern

Help Us Help Others By Improving the Database:

Does this information describe your movement accurately?

Data Verification Reports

Verification Serial Map

Anonymous · June 16, 2021

Serial Number 968077 was reported as accurate.

Anonymous · November 11, 2020

Serial Number 968492 was reported as accurate.

E. Howard Watch Co. (Keystone) Grade Series 4 Pocket Watch Movement