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

E. Howard Watch Co. (Keystone)

Grade: Series 4

Manufacturer: E. Howard Watch Co. (Keystone)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 972570
Grade: Series 4
Model: 1905
Estimated Production Year: 1910
Run Quantity: 1,000
Grade/Model Run: 19 of 22
Grade/Model Total Production: 16,610
Variant Est. Production: 2,500 (16S-M1905-17J-ONL)
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: Lever
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
Case: Various
Run ID: 100.G19.16S82.161905M74.O56.L4.17J77
Database Version: v52.219
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
39.16
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
130.83
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
2.531%
Registry Population: 26 (2.60%)
$ Estimated Value (12 Month Change): -14.01% Analyzing 69 Sales
Research Note: #972327 and #972878: Reported as Pendant-Set. #972884: Consistent with "Series 4" classification but marked "No. 2" and featured wide stripe pattern.

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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.


Anonymous · January 1, 2022

Serial Number 972040 was reported as accurate.

Anonymous · September 29, 2021

Serial Number 972866 was reported as accurate.

snellingt Supporter 32 · August 21, 2020

Serial Number 972139 was reported as accurate.

Anonymous · March 20, 2020

Serial Number 972991 was reported as accurate.

Andrew9000 85 · February 26, 2020

Serial Number 972570 was reported as accurate.

Andrew9000 85 · February 26, 2020

Serial Number 972570 was reported as accurate.

Anonymous · November 17, 2019

Serial Number 972487 was reported as inaccurate.

Note: This movement is pendant set although the lever
set cutout is present on the dial side of the
pillar plate. The balance wheel has 4 gold mean
time screws but the remaining weighting screws are
brass which is characteristic of a 3 position
movement. This movement maybe an example of the
transition of the 5 position series 4 to a 3
position series 9, while keeping the same
damaskeening. There is no clear cut SN demarcation
where this change began to take place,

Anonymous · January 6, 2019

Serial Number 972476 was reported as accurate.

avpalermo Supporter 568 · December 19, 2018

Serial Number 972087 was reported as accurate.

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