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)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 1090140
Grade: Series 5
Variation: Hooked Bridge Jeweled Barrel
Model: 1907
Estimated Production Year: 1911
Run Quantity: 1,000
Grade/Model Run: 17 of 27
Grade/Model Total Production: 16,600
Variant Est. Production: 9,800 (16S-M1907-19J-ONL-A5PTI-HOOKED BRIDGE JEWELED BARREL)
Size: 16s
Jewels: 19j
Jewel Material: Ruby & Sapphire
Movement Configuration: Openface
Movement Finish: Nickel
Movement Setting: Lever or Pendant
Plate: Bridge Plate
Bridge Type: Center
Double Roller: Yes
Barrel: Jeweled Safety
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
Case: Various
Run ID: 183.G17.16S122.161907M33.O103.L10.19J28
Database Version: v52.235
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
45.76
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
152.05
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
2.942%
Registry Population: 9 (0.90%)
Research Note: #1090304: Reported as Marked "No. 5"

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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.


ebsrods Supporter 111 · December 3, 2023

Serial Number 1090253 was reported as inaccurate.

Note: These Lever sets were Railroad approved. Even
some pendents was allowed in certain areas.
Curator Response: Thanks for the report. Yes, the lever-set movements from this run would certainly have qualified for railroad service. However, the pendant-set movements would not have been approved on most American railroads at the time (yes, exceptions exist, but they were not the norm and would not justify a "railroad grade" classification).

rmwatchandclock Supporter 366 · November 30, 2022

Serial Number 1090655 was reported as accurate.

Anonymous · August 17, 2022

Serial Number 1090655 was reported as accurate.

cbzimm Supporter 468 · November 26, 2021

Serial Number 1090305 was reported as accurate.

Anonymous · June 5, 2021

Serial Number 1090030 was reported as accurate.

Anonymous · May 24, 2021

Serial Number 1090215 was reported as accurate.

Anonymous · May 24, 2021

Serial Number 1090215 was reported as accurate.

Anonymous · April 12, 2021

Serial Number 1090221 was reported as accurate.

pmtime Supporter 405 · September 4, 2019

Serial Number 1090374 was reported as accurate.

Anonymous · June 22, 2019

Serial Number 1090851 was reported as accurate.

Anonymous · February 27, 2019

Serial Number 1090331 was reported as accurate.

E. Howard Watch Co. (Keystone) Grade Series 5 Pocket Watch