E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 928360 (Grade Series 3)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/928360/movement

Access Date: December 28, 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 3

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	928360
Grade:	Series 3
Model:	1905
Estimated Production Year:	1906
Run Quantity:	3,000
Grade/Model Run:	21 of 39
Grade/Model Total Production:	49,390
Variant Est. Production:	22,550 (16S-M1905-17J-ONP)
Size:	16s
Jewels:	17j
Jewel Material:	Ruby & Sapphire
Jewel Setting:	Gold Settings (Screw-Set)
Movement Configuration:	Openface
Movement Finish:	Nickel
Finish Pattern:	Circular
Movement Setting:	Pendant
Plate:	3/4 Plate
Regulator:	Reed
Hairspring:	Breguet
Pallet Jewel Material:	Sapphire
Standard Dial Type:	Single-Sunk
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	3
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Dial Feet Locations:	10.7, 24.3, 48.9
U.S. Patents:	781263, 796162, 886387, 900183, 992013, 971496, 978612, 981667
Movement Markings:	E. Howard Watch Co. Boston U.S.A. Adjusted 17 Jewels Pat'd. '05
Case:	Various
Run ID:	55.G21.16S32.161905M31.O34.P46.17J34
Database Version:	v52.528
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	67.89
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	238.77
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	4.313%
Registry Population: Scoped for This Run Only	78 (2.60%)
$ Estimated Value (12 Month Change):	17.32% Analyzing 195 Sales
Research Note: #927004: Reported with Checkerboard Pattern. #927824: Reported as Lever-Set. #928968 and #929993: Reported as Hunting instead of Openface.

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Production Metrics Tree: Grade Series 3

Target Profile: 16S-M1905-17J-ONP-A3PTI

E. Howard Watch Co. (Keystone) Grade Series 3 (All Variations): 49,390 ETP
16S: 49,390 100.00% 16s, Grade Series 3
16S-M1905: 49,390 100.00% 16s, Grade Series 3, Model 1905
16S-M1905-17J: 49,390 100.00% 16s, Grade Series 3, Model 1905, 17 Jewels
16S-M1905-17J-ONP: 22,550 45.66% 16s, Grade Series 3, Model 1905, 17 Jewels, Openface/Pendant/Nickel	Other: 26,840 Other Configs or Unclassified
16S-M1905-17J-ONP-A3PTI: 22,550 45.66%

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.