Pocket Watch Database
Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/rockford/519345
https://pocketwatchdatabase.com/search/result/rockford/519345
Access Date: December 18, 2024
From the American Horology Archive:
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 |
|
| Case: | Various | |
| Run ID: | 613.900G1.18S546.187M121.O159.L475.24J1 | |
| Data Research: |
1907 Rockford Serial List |
|
| Database Version: | v52.515 | |
| 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: Scoped for This Run Only | 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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Production Metrics Tree: Grade 900
Target Profile: 18S-M7-24J-ONL-A5PTI
| Rockford Grade 900 (All Variations): 1,100 ETP | |
| 18S: 1,100 100.00% 18s, Grade 900 |
|
| 18S-M7: 100 9.09% 18s, Grade 900, Model 7 |
Other: 1,000
Other Models or Unclassified |
| 18S-M7-24J: 100 9.09% 18s, Grade 900, Model 7, 24 Jewels |
|
| 18S-M7-24J-ONL: 100 9.09% 18s, Grade 900, Model 7, 24 Jewels, Openface/Lever/Nickel |
|
| 18S-M7-24J-ONL-A5PTI: 100 9.09% | |
Population Registry for This Run
| Image | Serial Number | Run Position | Primary Identification Method | Discovery Date | |
|---|---|---|---|---|---|
|
There are 4 watches in the population registry for this run with 2 images.
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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
