Pocket Watch Database

From the American Horology Archive:
Hamilton Grade 990 Pocket Watch

Hamilton Watch Co.

Grade: 990

Manufacturer: Hamilton
Manufacturer Location: Lancaster, Pennsylvania
Movement Serial Number: 342297
Grade: 990
Model: 1
Estimated Production Year: 1906
Run Quantity: 300
Grade/Model Total Production: 12,599
Size: 16s
Jewels: 21j
Jewel Material: Ruby & Sapphire
Jewel Setting: Gold Settings (Screw-Set)
Movement Configuration: Openface
Movement Finish: Nickel
Movement Setting: Lever
Plate: 3/4 Plate
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: 7.6, 21.8, 38.0, 50.5
Hamilton 16s Dial Feet Research
Data Research: 1953 Hamilton Serial List
Case: Various
Registry Population: 9 (3.00%)
Database Version: v49.708

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1 342011 #11 Marketplace December 20, 2019
2 342032 #32 Marketplace March 08, 2020
3 342052 #52 Marketplace February 07, 2018
4 342134 #134 Inferred
5 342143 #143 Marketplace February 28, 2017
6 342210 #210 Marketplace September 03, 2021
7 342237 #237 Marketplace February 22, 2021
8
Image Credit: bwalder
342297 #297 Collection March 24, 2016
9
Image Credit: MichaelB
342299 #299 Collection April 30, 2017
Standard Deviation of Known Examples: 110.49 (Expected: 86.75, Δ23.74/7.91%)

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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 · August 3, 2022

Serial Number 342049 was reported as accurate.

Anonymous · June 11, 2022

Serial Number 342147 was reported as accurate.

Anonymous · August 24, 2021

Serial Number 342210 was reported as accurate.

Anonymous · February 17, 2021

Serial Number 342237 was reported as accurate.

Anonymous · October 26, 2019

Serial Number 342261 was reported as accurate.

MichaelB 150 · April 30, 2017

Serial Number 342299 was reported as accurate.

Anonymous · July 19, 2014

Serial Number 342297 was reported as accurate.

Changes since this report was submitted:
Double Roller changed from Yes to No

Anonymous · February 28, 2014

Serial Number 342070 was reported as accurate.

Changes since this report was submitted:
Double Roller changed from Yes to No

Anonymous · May 1, 2013

Serial Number 342108 was reported as inaccurate.

No further details were submitted with the report.
Changes since this report was submitted:
Plate changed from Unknown to 3/4
Hamilton Grade 990 Pocket Watch