E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 51558 (Grade Series 12)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/51558

Access Date: November 22, 2024

There is an alternative result available for this serial number. View the result for E. Howard & Co. movement #51558.

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:	51558
Grade:	Series 12
Model:	1921
Estimated Production Year:	1928
Run Quantity:	3,000
Grade/Model Run:	4 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] 17J Pat'd. '21
Case:	Various
Run ID:	14.G4.10S13.101921M13.O14.P14.17J4
Database Version:	v52.452
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	5 (0.17%)

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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
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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.