E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 955321 (Grade Series 4)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/955321/link

Access Date: December 04, 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 4

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	955321
Grade:	Series 4
Model:	1905
Estimated Production Year:	1908
Run Quantity:	1,000
Grade/Model Run:	10 of 24
Grade/Model Total Production:	16,350
Variant Est. Production:	7,420 (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:	Checkerboard
Movement Setting:	Pendant
Plate:	3/4 Plate
Double Roller:	Yes
Regulator:	Reed
Hairspring:	Breguet
Pallet Jewel Material:	Sapphire
Standard Dial Type:	Single-Sunk
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	5
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Railroad Grade:	No
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:	87.G10.16S64.161905M58.O52.P78.17J61
Database Version:	v52.479
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	36.79
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	129.34
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	2.337%
Registry Population: Scoped for This Run Only	21 (2.10%)
Research Note: #955294: Reported as Lever-Set. #955942: Reported as Hunting instead of Openface. #955728: Verified with Gold Meantime Screws and Brass Balance Screws (more consistent with the Series 9) [JH]

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Production Metrics Tree: Grade Series 4

Target Profile: 16S-M1905-17J-ONP-A5PTI

E. Howard Watch Co. (Keystone) Grade Series 4 (All Variations): 16,350 ETP
16S: 16,350 100.00% 16s, Grade Series 4
16S-M1905: 16,350 100.00% 16s, Grade Series 4, Model 1905
16S-M1905-17J: 16,350 100.00% 16s, Grade Series 4, Model 1905, 17 Jewels
16S-M1905-17J-ONP: 7,420 45.38% 16s, Grade Series 4, Model 1905, 17 Jewels, Openface/Pendant/Nickel	Other: 8,930 Other Configs or Unclassified
16S-M1905-17J-ONP-A5PTI: 7,420 45.38%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 21 watches in the population registry for this run with 6 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.