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: 859495
Grade: Series 4
Model: 1905
Estimated Production Year: 1905
Run Quantity: 480
Total Production: 16,610
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: 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
Database Version: v48.139
Research Note: Mixed Run: #859040, #859168, #859193, and #859410 Reported as Featuring Checkerboard Pattern (Some Marked A3P). #859495: Verified as featuring the checkerboard damaskeening pattern consistent with the Grade 4 classification, marked "Adjusted."

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Data Verification Reports

859021
Verification Serial Map
859500

PHIL1199 Supporter 455 · October 15, 2021

Serial Number 859495 was reported as accurate.

rmwatchandclock 234 · September 7, 2021

Serial Number 859495 was reported as inaccurate.

Note: Serial number 859495 I believe is a series 9, not
series 2. Photos have been uploaded to my
collection.
Curator Response: Thanks for the report. This one is a bit too early to be a Grade 9, but it is consistent with the Grade 4 classification that preceeded the Grade 9. I have refined the runs a bit based on recent observations, defining this run as the first Grade 4 production.
Changes since this report was submitted:
Grade changed from Series 2 to Series 4

Anonymous · August 12, 2019

Serial Number 859472 was reported as accurate.

Changes since this report was submitted:
Grade changed from Series 2 to Series 4
Plate changed from Bridge to 3/4
E. Howard Watch Co. (Keystone) Grade Series 4 Pocket Watch Movement