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: 850309
Grade: 990
Model: 1
Estimated Production Year: 1912
Run Quantity: 500
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: 22.3, 38.0, 57.1
Hamilton 16s Dial Feet Research
Data Research: 1953 Hamilton Serial List
Case: Various
Registry Population: 14 (2.80%)
Database Version: v49.716

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1
Image Credit: MichaelB
850309 #9 Collection October 25, 2017
2 850317 #17 Marketplace December 16, 2019
3 850329 #29 Inferred
4 850378 #78 Marketplace February 08, 2018
5 850423 #123 Inferred
6 850486 #186 Marketplace April 24, 2021
7 850491 #191 Marketplace April 28, 2014
8 850509 #209 Marketplace February 20, 2018
9 850522 #222 Marketplace November 23, 2021
10 850589 #289 Collection December 23, 2016
11 850664 #364 Marketplace February 24, 2021
12 850708 #408 Inferred
13 850717 #417 Marketplace September 01, 2022
14
Image Credit: firebirdjeff02
850793 #493 Collection June 02, 2020
Standard Deviation of Known Examples: 158.83 (Expected: 144.48, Δ14.35/2.87%)

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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.


rmwatchandclock Supporter 290 · August 31, 2022

Serial Number 850717 was reported as accurate.

Anonymous · March 15, 2021

Serial Number 850664 was reported as accurate.

Anonymous · August 3, 2020

Serial Number 850329 was reported as accurate.

Anonymous · February 9, 2019

Serial Number 850308 was reported as accurate.

Anonymous · January 19, 2019

Serial Number 850513 was reported as accurate.

Anonymous · January 14, 2017

Serial Number 850528 was reported as accurate.

Anonymous · November 24, 2016

Serial Number 850696 was reported as accurate.

Anonymous · November 5, 2016

Serial Number 850652 was reported as accurate.

daddo46 987 · November 1, 2016

Serial Number 850696 was reported as accurate.

Anonymous · January 4, 2015

Serial Number 850457 was reported as accurate.

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

Firebirdjeff 41 · September 26, 2014

Serial Number 850793 was reported as accurate.

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

Anonymous · January 26, 2014

Serial Number 850527 was reported as accurate.

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

Anonymous · October 6, 2013

Serial Number 850370 was reported as accurate.

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

Anonymous · March 25, 2013

Serial Number 850527 was reported as inaccurate.

Note: 3/4 plate
Changes since this report was submitted:
Plate changed from Unknown to 3/4

Anonymous · February 23, 2013

Serial Number 850527 was reported as accurate.

Anonymous · January 12, 2013

Serial Number 850719 was reported as accurate.

Hamilton Grade 990 Pocket Watch