E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 1102378 (Grade Series 1)

Sell Your Watch Save to My Collection Print Page Find a Mainspring Find a Balance Staff

Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/1102378/movement

Access Date: December 22, 2024

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 1

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	1102378
Grade:	Series 1
Variation:	Mixed
Model:	1907
Estimated Production Year:	1910
Run Quantity:	1,000
Grade/Model Run:	4 of 7
Grade/Model Total Production:	5,700
Variant Est. Production:	3,000 (16S-M1907-21J-ONL-A0PTI-MIXED)
Size:	16s
Jewels:	21j
Jewel Material:	Ruby & Sapphire
Movement Configuration:	Openface
Movement Finish:	Nickel
Finish Pattern:	Parallel
Movement Inlay Color:	Black
Movement Setting:	Lever or Pendant
Plate:	Bridge Plate
Bridge Type:	Center
Double Roller:	Yes
Barrel:	Safety
Regulator:	Reed
Hairspring:	Breguet
Pallet Jewel Material:	Sapphire
Standard Dial Type:	Double-Sunk
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	3 or 5
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Railroad Grade:	No
Dial Feet Locations:	10.7, 24.3, 48.9
Movement Markings:	Arrow and Star
Case:	Various
Run ID:	197.G6.16S135.161907M35.O121.L7.21J15
Database Version:	v52.517
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	17.16
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	60.28
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	1.090%
Registry Population: Scoped for This Run Only	2 (0.20%)
Research Note: #1102100: Reported as Series 0 (23 Jewels). #1102740: Verified as Marked "No. 10" with Jeweled Safety Barrel.

Value Guide

What is My Watch Worth?

Have a Question?

Ask the experts in The Pocket Watch Group

Production Metrics Tree: Grade Series 1

Target Profile: 16S-M1907-21J-ONL-A0PTI-MIXED

E. Howard Watch Co. (Keystone) Grade Series 1 (All Variations): 6,700 ETP
16S: 6,700 100.00% 16s, Grade Series 1
16S-M1907: 5,700 85.07% 16s, Grade Series 1, Model 1907			Other: 1,000 Other Models or Unclassified
16S-M1907-21J: 5,500 82.09% 16s, Grade Series 1, Model 1907, 21 Jewels		Other: 200 Other Jewels or Unclassified
16S-M1907-21J-ONL: 5,500 82.09% 16s, Grade Series 1, Model 1907, 21 Jewels, Openface/Lever or Pendant/Nickel
16S-M1907-21J-ONL-A0PTI: 5,500 82.09%
16S-M1907-21J-ONL-A0PTI-MIXED: 3,000 44.78%	Other: 2,500 Other Variants or Unclassified

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 2 watches in the population registry for this run. Create a FREE account or login to view the population registry and add your watch to the registry. Create a Free Account

Help Us Help Others By Improving the Database:

Does this information describe your movement accurately?

Yes

Why Might This Information Be Incorrect?

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.