E. Howard Watch Co. (Keystone) Pocket Watch: Serial Number 935231 (Grade Series 2)

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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/e.-howard-watch-co.-keystone/935231/link

Access Date: November 25, 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 2

Manufacturer:	E. Howard Watch Co. (Keystone)
Manufacturer Location:	Waltham, Massachusetts
Movement Serial Number:	935231
Grade:	Series 2
Model:	1905
Estimated Production Year:	1907
Run Quantity:	570
Grade/Model Run:	9 of 12
Grade/Model Total Production:	4,750
Variant Est. Production:	1,650 (16S-M1905-17J-ONP)
Size:	16s
Jewels:	17j
Jewel Material:	Ruby & Sapphire
Jewel Setting:	Raised Gold Settings (Screw-Set)
Movement Configuration:	Openface
Movement Finish:	Nickel
Finish Pattern:	Parallel Bar (mixed)
Movement Setting:	Pendant
Plate:	3/4 Plate
Double Roller:	Yes
Regulator:	Reed
Hairspring:	Breguet
Pallet Jewel Material:	Sapphire
Standard Dial Type:	Double-Sunk
Adjusted:	Yes
Adjusted to Position:	Yes
Adjusted # of Positions:	5
Adjusted to Temperature:	Yes
Adjusted to Isochronism:	Yes
Railroad Grade:	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:	64.G9.16S41.161905M40.O39.P55.17J43
Database Version:	v52.462
Advanced Metrics
PWDB Absolute Rarity Index: Scoped for Grade/Size/Model/Configuration	7.37
PWDB Relative Rarity Index: Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration	25.85
Share of Production: Share within Manufacturer - Scoped for Grade/Size/Model/Configuration	0.469%
Registry Population: Scoped for This Run Only	16 (2.81%)
Research Note: #935455 and #935764: Reported as Lever-Set, #935584: Reported with Checkerboard pattern and marked "Adjusted 3 Positions," #935760: Reported as Marked "Adjusted 5 Positions." #935355: Verified as Marked "No. 9" and "Adjusted 3 Pos." (Pendant) with Wide Parallel Damaskeening [NAWCC]

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Production Metrics Tree: Grade Series 2

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

E. Howard Watch Co. (Keystone) Grade Series 2 (All Variations): 11,250 ETP
16S: 11,250 100.00% 16s, Grade Series 2
16S-M1905: 4,750 42.22% 16s, Grade Series 2, Model 1905		Other: 6,500 Other Models or Unclassified
16S-M1905-17J: 4,750 42.22% 16s, Grade Series 2, Model 1905, 17 Jewels
16S-M1905-17J-ONP: 1,650 14.67% 16s, Grade Series 2, Model 1905, 17 Jewels, Openface/Pendant/Nickel	Other: 3,100 Other Configs or Unclassified
16S-M1905-17J-ONP-A5PTI: 1,650 14.67%

Population Registry for This Run

	Image	Serial Number	Run Position	Primary Identification Method	Discovery Date
There are 16 watches in the population registry for this run with 1 image. 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 · March 23, 2024

Serial Number 935311 was reported as accurate.

Changes since this report was submitted:

Movement Setting changed from Mixed to Pendant

Railroad Grade changed from No to Yes

Anonymous · November 27, 2023

Serial Number 935695 was reported as inaccurate.

Note: wide slant parallel damskeening
marked "17 jewels"
marked "adjusted 5 pos"
lever set
sapphire pallets
steel escape wheel
double roller
railroad grade

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

Changes since this report was submitted:

Movement Setting changed from Mixed to Pendant

Railroad Grade changed from No to Yes

Anonymous · August 30, 2020

Serial Number 935695 was reported as inaccurate.

Note: Almost a yes. However this movement, while 17j
and open faced with lever set, has wide parallel
finish and marked "adjusted 5 pos."

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

Changes since this report was submitted:

Movement Setting changed from Mixed to Pendant

Railroad Grade changed from No to Yes

Anonymous · July 1, 2020

Serial Number 935503 was reported as inaccurate.

Note: series 4 with checkerboard damaskeen

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

Changes since this report was submitted:

Movement Setting changed from Mixed to Pendant

Railroad Grade changed from No to Yes

Plate changed from Bridge to 3/4

Anonymous · May 9, 2019

Serial Number 935355 was reported as inaccurate.

Note: While this movement has the damaskeening of a
3/4 plate series 2. it is marked No.9 and Adj. 3
Pos. Is there any reason for this ?

Curator Response: Thanks for the report. The information on this serial number was previously recorded in the research notes for the run. There have been various markings found on the Keysone Howard movements that do not match the expected grade classification. This particular movement was produced prior to the introduction of the "official" Series 9. It is possible the company was begining to experiement with offering a 3-Position 3/4 plate movement at the time and finished a Series 2 with 3 Positional Adjustements instead of 5 and marked it accordingly.

Changes since this report was submitted:

Movement Setting changed from Mixed to Pendant

Railroad Grade changed from No to Yes

Plate changed from Bridge to 3/4