Pocket Watch Database

From the American Horology Archive:
Rockford Grade 900 Pocket Watch

Rockford Watch Co.

Grade: 900

Manufacturer: Rockford
Manufacturer Location: Rockford, Illinois
Movement Serial Number: 519345
Grade: 900
Model: 7
Estimated Production Year: 1898
Run Quantity: 100
Grade/Model Run: 1 of 1
Grade/Model Total Production: 100
Size: 18s
Jewels: 24j
Jewel Material: Ruby & Sapphire
Jewel Setting: Gold Settings (Screw-Set)
Movement Configuration: Openface
Movement Finish: Nickel
Finish Pattern: Fishscale
Movement Signing Style: Block Letter
Movement Inlay Color: Gilt
Movement Setting: Lever
Plate: Full Plate
Double Roller: Yes
Regulator: Micrometer
Hairspring: Breguet
Escapement Type: Straight-line
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
Movement Markings: Rockford
Watch Co.
U.S.A.
24 Jewels
Adjusted
Data Research: 1907 Rockford Serial List
Case: Various
Run ID: 613.900G1.18S546.187M121.O159.L475.24J1
Database Version: v52.219
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
0.30
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
3.05
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
0.016%
Registry Population: 4 (4.00%)
Research Note: Despite being listed as a Model 9 in the factory serial lists, the first Grade 900 run was actually produced as a transitional hybrid of the Model 7 and 9. This run features the old style hairspring stud fitted on the barrel-side of the balance cock, differentiating from the opposite side for standard Model 7 movements. As a result, the regulator spring is mirrored compared to a standard Model 7 movement but moved to a position more consistent with the Model 9. Additionally, the old style Model 7 balance cock is used, though the upper balance cap jewel is screw-set instead of pressed, typically a feature of the Model 9. By the beginning of the next run, the movement featured all the traits consistent with the Model 9 designation.

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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 · December 23, 2019

Serial Number 519315 was reported as accurate.

pocketwatch101 111 · April 16, 2016

Serial Number 519345 was reported as accurate.

TimeAntiquarian Founder Research Expert Historian Top Contributor Supporter 171 · March 30, 2016

Serial Number 519327 was reported as accurate.

Anonymous · January 31, 2015

Serial Number 519319 was reported as inaccurate.

Note: should be a model 7 and Rockford grade
Changes since this report was submitted:
Factory Model changed from 9 to 7
Rockford Grade 900 Pocket Watch