E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 55770 (Grade Series 12)

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Keystone Howard 10s 17j OF YGF Pocket Watch S/N 55321 Series 12 -RTAI033125

Check Price Source: eBay.com

Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/55770/movement

Access Date: May 07, 2025

There is an alternative result available for this serial number. View the result for E. Howard & Co. movement #55770.

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 12

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	55770
Grade:	Series 12
Model:	1921
Estimated Production Year:	Login to View
Run Quantity:	Login to View
Grade/Model Run:	Login to View
Grade/Model Total Production:	Login to View
Size:	10s
Jewels:	17j
Movement Configuration:	Openface
Movement Finish:	Nickel
Finish Pattern:	Login to View
Movement Setting:	Pendant
Wind Mechanism:	Pendant
Plate:	Bridge Plate
Regulator:	Login to View
Hairspring:	Login to View
Adjusted:	Login to View
Adjusted to Position:	Login to View
Adjusted # of Positions:	Login to View
Adjusted to Temperature:	Login to View
Adjusted to Isochronism:	Login to View
Railroad Grade:	Login to View
Movement Markings:	Login to View
Case:	Various
Run ID:	16.G5.10S15.101921M15.O16.P16.17J5
Database Version:	v52.645
Advanced Metrics
Members Only Data. Login or create a free account to unlock.
Registry Population: Scoped for This Run Only	14 (0.13%)

14 Additional Member-Only Data Points Available

The following information is unlocked with a free account:

Estimated Production Year, Run Quantity, Grade/Model Run, Grade/Model Total Production, Finish Pattern, Regulator Type, Hairspring, Adjustments, Adjusted to Position, Positional Adjustments, Temperature Adjustments, Isochronism Adjustments, Railroad Grade Designation, Movement Markings

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Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 14 watches in the population registry for this run with 5 images. 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?

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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.

Anonymous · March 16, 2025

Serial Number 58510 was reported as accurate.

Anonymous · March 14, 2023

Serial Number 61982 was reported as accurate.

Anonymous · February 3, 2023

Serial Number 56897 was reported as accurate.

MIKEKTYLER Supporter 128 · November 24, 2022

Serial Number 61982 was reported as accurate.

Anonymous · August 31, 2022

Serial Number 57658 was reported as accurate.

Anonymous · May 12, 2022

Serial Number 57345 was reported as inaccurate.

No further details were submitted with the report.

Anonymous · January 1, 2022

Serial Number 53487 was reported as accurate.

cmdraven 4126 · December 7, 2021

Serial Number 53311 was reported as accurate.

Anonymous · September 26, 2021

Serial Number 55656 was reported as accurate.

Anonymous · September 20, 2021

Serial Number 61786 was reported as accurate.

Anonymous · July 27, 2021

Serial Number 55040 was reported as inaccurate.

Note: I have SN: 55040: Series V, Gilt movement finish,
size L (16s), Key set and may be a conversion to
stem wind (no tang visible), Breguet H.S.,3/4 back
plate. Thank you. S.B.

Curator Response: Please conduct your serial lookup under the "E. Howard & Co." manufacturer instead of the Keystone Howard database. https://pocketwatchdatabase.com/search/result/e.-howard-co/55040