E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 12790 (Grade Series 12)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/12790

Access Date: November 19, 2024

There is an alternative result available for this serial number. View the result for E. Howard & Co. movement #12790.

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:	12790
Grade:	Series 12
Model:	1921
Estimated Production Year:	1921
Run Quantity:	26,000
Grade/Model Run:	1 of 5
Grade/Model Total Production:	47,450
Size:	10s
Jewels:	17j
Movement Configuration:	Openface
Movement Finish:	Nickel
Finish Pattern:	Standard Stripe
Movement Setting:	Pendant
Plate:	Bridge Plate
Regulator:	Plain
Hairspring:	Breguet
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	3
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Railroad Grade:	No
Movement Markings:	E. Howard Watch Co. Boston, U.S.A. [Empty Circle in Arrow] Pat'd. '21 [Some Additionally Marked "17J"]
Case:	Various
Run ID:	8.G1.10S7.101921M7.O8.P8.17J1
Database Version:	v52.446
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	142.86
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	502.54
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	9.081%
Registry Population: Scoped for This Run Only	41 (0.16%)

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Production Metrics Tree: Grade Series 12

Target Profile: 10S-M1921-17J-ONP-A3PTI

E. Howard Watch Co. (Keystone) Grade Series 12 (All Variations): 47,450 ETP

10S: 47,450 100.00%
10s, Grade Series 12

10S-M1921: 47,450 100.00%
10s, Grade Series 12, Model 1921

10S-M1921-17J: 47,450 100.00%
10s, Grade Series 12, Model 1921, 17 Jewels

10S-M1921-17J-ONP: 47,450 100.00%
10s, Grade Series 12, Model 1921, 17 Jewels, Openface/Pendant/Nickel

10S-M1921-17J-ONP-A3PTI: 47,450 100.00%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 41 watches in the population registry for this run with 15 images. Create a FREE account or login to view the population registry and add your watch to the registry. Create a Free Account

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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 · November 18, 2024

Serial Number 32370 was reported as accurate.

Anonymous · November 15, 2024

Serial Number 32370 was reported as accurate.

Anonymous · September 14, 2024

Serial Number 34457 was reported as inaccurate.

No further details were submitted with the report.

cjbrem Supporter 915 · August 27, 2024

Serial Number 18368 was reported as accurate.

Anonymous · April 24, 2024

Serial Number 13700 was reported as accurate.

Anonymous · February 10, 2024

Serial Number 25445 was reported as accurate.

Anonymous · August 28, 2023

Serial Number 21912 was reported as accurate.

cbzimm Supporter 469 · April 30, 2023

Serial Number 29984 was reported as accurate.

Anonymous · March 16, 2023

Serial Number 34317 was reported as accurate.

ralph1 113 · November 28, 2022

Serial Number 21524 was reported as accurate.

Anonymous · September 2, 2022

Serial Number 25162 was reported as inaccurate.

Note: 21 jewels for this serial number

Curator Response: Thanks for the report. If possible, please upload an image of the movement to your collection for further evaluation and documentation.

Anonymous · August 14, 2022

Serial Number 26689 was reported as accurate.

Anonymous · May 14, 2022

Serial Number 37767 was reported as accurate.

2251lyle 78 · April 1, 2022

Serial Number 13677 was reported as accurate.

Anonymous · February 25, 2022

Serial Number 18485 was reported as accurate.

mcopper 55 · February 19, 2022

Serial Number 28797 was reported as accurate.

2mnyboxers Supporter 408 · February 14, 2022

Serial Number 28301 was reported as accurate.

Anonymous · January 9, 2022

Serial Number 18609 was reported as accurate.

Anonymous · January 8, 2022

Serial Number 12813 was reported as accurate.

Anonymous · December 25, 2021

Serial Number 34199 was reported as accurate.

Pinko2 69 · December 21, 2021

Serial Number 13677 was reported as accurate.

Anonymous · December 15, 2021

Serial Number 27260 was reported as accurate.

Anonymous · December 13, 2021

Serial Number 25604 was reported as inaccurate.

No further details were submitted with the report.

Anonymous · November 28, 2021

Serial Number 15275 was reported as accurate.

Anonymous · November 25, 2021

Serial Number 28834 was reported as accurate.

Anonymous · November 22, 2021

Serial Number 13677 was reported as accurate.

MoatsJustin1 top-contributor 5269 · October 28, 2021

Serial Number 12966 was reported as accurate.

CLOCKWORKBRIAN72 50 · October 21, 2021

Serial Number 32584 was reported as accurate.

MoatsJustin1 top-contributor 5269 · September 25, 2021

Serial Number 31267 was reported as accurate.

Anonymous · September 22, 2021

Serial Number 14071 was reported as accurate.

Anonymous · August 24, 2021

Serial Number 37611 was reported as accurate.

Anonymous · August 12, 2021

Serial Number 22846 was reported as accurate.

Anonymous · July 5, 2021

Serial Number 13492 was reported as accurate.

Anonymous · June 22, 2021

Serial Number 22544 was reported as inaccurate.

Note: Hello All, Please see:
eBay item number:224500394955
E. Howard mvmt: SN: 22544, 44.5mm, KWKS, Series
III. I do not own this so; the other details
cannot be verified. The database info does not
seem close to a match. Thank you. Steve Burns

Curator Response: Thanks for the report. The watch listed on eBay is a product of E. Howard & Co. rather than the E. Howard Watch Co. owned by Keystone. Here is the correct lookup page: https://pocketwatchdatabase.com/search/result/e.-howard-co/22544