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: 793857
Grade: 990
Model: 1
Estimated Production Year: 1911
Run Quantity: 200
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: 5 (2.50%)
Database Version: v49.708

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1 793715 #15 Inferred
2 793754 #54 Collection September 16, 2020
3 793798 #98 Marketplace November 06, 2020
4
Image Credit: Rascal
793857 #157 Collection August 07, 2015
5 793889 #189 Marketplace March 20, 2022
Standard Deviation of Known Examples: 71.56 (Expected: 57.88, Δ13.68/6.84%)

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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 15, 2022

Serial Number 793889 was reported as accurate.

Rascal 2 · September 11, 2019

Serial Number 793857 was reported as accurate.

Anonymous · February 12, 2018

Serial Number 793894 was reported as accurate.

Anonymous · August 19, 2014

Serial Number 793797 was reported as accurate.

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

Anonymous · August 16, 2014

Serial Number 793747 was reported as accurate.

Changes since this report was submitted:
Double Roller changed from Yes to No
Hamilton Grade 990 Pocket Watch