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: 1108565 Question Mark
Grade: Series 5 Question Mark
Variation: Hooked Bridge Jeweled Barrel Question Mark
Model: 1907 Question Mark
Estimated Production Year: 1911 Question Mark
Run Quantity: 1,000 Question Mark
Grade/Model Run: 21 of 26 Question Mark
Grade/Model Total Production: 16,400 Question Mark
Variant Est. Production: 9,800 (16S-M1907-19J-ONL-A5PTI-HOOKED BRIDGE JEWELED BARREL) Question Mark
Size: 16s Question Mark
Jewels: 19j Question Mark
Jewel Material: Ruby & Sapphire Question Mark
Movement Configuration: Openface Question Mark
Movement Finish: Nickel Question Mark
Movement Setting: Lever Question Mark
Plate: Bridge Plate Question Mark
Bridge Type: Center Question Mark
Double Roller: Yes Question Mark
Barrel: Jeweled Safety 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
Dial Feet Locations: 10.7, 24.3, 48.9 Question Mark
Movement Markings: E. Howard Watch Co.
Boston U.S.A.
Adjusted
19 Jewels
[Triangle in Arrow]
Pat'd. '08
Extra Adjustment
Five Positions
Temperature [Some Also Marked "No. 5"]
Case: Various Question Mark
Run ID: 207.G22.16S141.161907M41.O129.L28.19J33 Question Mark
Database Version: v52.431 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
43.95 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
154.56 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
2.794% Question Mark
Registry Population:
Scoped for This Run Only
10 (1.00%) Question Mark
$ Estimated Value (12 Month Change): -11.17% Analyzing 93 Sales Question Mark
Research Note: #1108165 and #1108910: Reported as Marked "No. 5" #1108086 and #1108157: Verified as Marked "No. 5", #1108987: Verified as Not 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.


Mobilaero Top Contributor Supporter 307 · April 27, 2024

Serial Number 1108681 was reported as accurate.

cjbrem Supporter 891 · March 24, 2024

Serial Number 1108815 was reported as accurate.

Anonymous · December 16, 2022

Serial Number 1108891 was reported as accurate.

Anonymous · March 5, 2021

Serial Number 1108887 was reported as accurate.

Anonymous · January 8, 2019

Serial Number 1108987 was reported as accurate.

Anonymous · October 18, 2018

Serial Number 1108626 was reported as accurate.

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