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: 830237
Grade: 990
Model: 1
Estimated Production Year: 1911
Run Quantity: 500
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: 13 (2.60%)
Database Version: v49.391

Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
1 830021 #21 Inferred
2 830032 #32 Marketplace December 10, 2017
3 830064 #64 Marketplace May 21, 2022
4 830183 #183 Collection February 01, 2019
5 830199 #199 Collection March 21, 2020
6 830237 #237 Collection September 07, 2019
7 830327 #327 Marketplace August 23, 2021
8 830346 #346 Marketplace February 01, 2013
9 830399 #399 Inferred
10 830431 #431 Inferred
11 830435 #435 Inferred
12 830462 #462 Marketplace November 10, 2014
13 830485 #485 Collection February 19, 2022
Standard Deviation of Known Examples: 167.27 (Expected: 144.48, Δ22.78/4.56%)

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Data Verification Reports

830001
Verification Serial Map
830500

Anonymous · August 15, 2021

Serial Number 830327 was reported as accurate.

Anonymous · February 4, 2021

Serial Number 830170 was reported as accurate.

slufdriver 60 · November 2, 2020

Serial Number 830237 was reported as accurate.

cfergyjr 11 · March 21, 2020

Serial Number 830199 was reported as accurate.

Anonymous · August 22, 2019

Serial Number 830237 was reported as accurate.

Anonymous · February 24, 2018

Serial Number 830485 was reported as accurate.

Anonymous · December 26, 2014

Serial Number 830068 was reported as inaccurate.

No further details were submitted with the report.
Changes since this report was submitted:
Double Roller changed from Yes to No

Anonymous · March 30, 2014

Serial Number 830398 was reported as accurate.

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

Anonymous · March 8, 2014

Serial Number 830163 was reported as accurate.

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

Anonymous · February 25, 2014

Serial Number 830184 was reported as accurate.

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

Anonymous · January 3, 2014

Serial Number 830215 was reported as accurate.

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

Anonymous · November 23, 2013

Serial Number 830294 was reported as accurate.

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

Anonymous · January 22, 2013

Serial Number 830346 was reported as accurate.

Anonymous · January 18, 2013

Serial Number 830346 was reported as accurate.

Anonymous · September 9, 2012

Serial Number 830396 was reported as accurate.

Hamilton Grade 990 Pocket Watch