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: 666038
Grade: 900
Model: 9
Estimated Production Year: 1905
Run Quantity: 500
Grade/Model Run: 4 of 4
Grade/Model Total Production: 1,000
Size: 18s
Jewels: 24j
Jewel Material: Ruby & Sapphire
Jewel Setting: Gold Settings (Screw-Set)
Movement Configuration: Openface
Movement Finish: Nickel
Movement Signing Style: Serif (Decorative)
Movement Inlay Color: Gilt
Movement Setting: Lever
Plate: Full Plate
Double Roller: Yes
Regulator: Type 7
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 Wat ch Co.
U.S.A.
R.G.
900
24 Jewels
5 Positions
Adjusted
Double Roller
Case: Various
Run ID: 970.900G5.18S709.189M81.O351.L729.24J8
Data Research: 1907 Rockford Serial List
Database Version: v52.355
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
3.01
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
30.75
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
0.156%
Registry Population: 23 (4.60%)
Research Note: The c.1907 factory serial lists designates the last run of Grade 900 as consisting of 100 movements [666,001-666,100] with the following serial block beginning at 667,001. Evidence supports that the initial run was extended beyond the published run of 100. Various observations have confirmed that this run is closer to 500 total movements [666,001-666,500]. The highest reported serial number is 666,476. With these conclusions, the estimated total production of the Grade 900 has been increased by 400 to 1,100.

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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 · February 5, 2024

Serial Number 666479 was reported as accurate.

Anonymous · January 25, 2024

Serial Number 666240 was reported as accurate.

Anonymous · January 16, 2024

Serial Number 666240 was reported as accurate.

ChrisG Top Contributor Supporter 560 · December 5, 2023

Serial Number 666240 was reported as accurate.

Anonymous · March 29, 2021

Serial Number 666044 was reported as accurate.

Anonymous · January 25, 2021

Serial Number 666088 was reported as accurate.

Anonymous · April 16, 2019

Serial Number 666329 was reported as accurate.

Johnsmithburg 1 · March 31, 2019

Serial Number 666128 was reported as accurate.

Anonymous · January 5, 2019

Serial Number 666100 was reported as accurate.

WilliamAtkinson 2 · February 7, 2018

Serial Number 666476 was reported as accurate.

Anonymous · February 7, 2018

Serial Number 666476 was reported as accurate.

oilseed Supporter 471 · January 18, 2018

Serial Number 666331 was reported as accurate.

oilseed Supporter 471 · January 18, 2018

Serial Number 666347 was reported as accurate.

Linearpcs 22 · August 29, 2015

Serial Number 666050 was reported as accurate.

Anonymous · April 5, 2015

Serial Number 666033 was reported as accurate.

Gasperoff Supporter 727 · February 10, 2015

Serial Number 666292 was reported as accurate.

Anonymous · July 23, 2014

Serial Number 666472 was reported as accurate.

Anonymous · July 10, 2014

Serial Number 666256 was reported as inaccurate.

Note: Additional comment on my watch: elliptical jewel
setting on the barrel bridge is missing.Could it
be a faked 24J like indicated in _The complete
price guide to wathes, 2006 edition_?

TimeAntiquarian Founder Research Expert Historian Top Contributor Supporter 171 · March 29, 2014

Serial Number 666164 was reported as accurate.

TimeAntiquarian Founder Research Expert Historian Top Contributor Supporter 171 · March 29, 2014

Serial Number 666446 was reported as accurate.

Anonymous · February 14, 2014

Serial Number 666256 was reported as inaccurate.

Note: 24 jewels, adj 5 positions, double roller,grade
900, Ni, DMK, lever set, railroad grade, open face
Changes since this report was submitted:
Grade changed from Unknown to 900
Jewels changed from ? to 24j
Movement Configuration changed from Hunting to Openface
Factory Model changed from 0 to 9
Railroad Grade changed from No to Yes

Anonymous · February 12, 2014

Serial Number 666376 was reported as inaccurate.

Note: Grade = 900
Jewels = 24
Adjustments = 5
Changes since this report was submitted:
Grade changed from Unknown to 900
Jewels changed from ? to 24j
Movement Configuration changed from Hunting to Openface
Factory Model changed from 0 to 9
Railroad Grade changed from No to Yes
Rockford Grade 900 Pocket Watch