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From the American Horology Archive:
Rockford Watch Co.

Grade: 164

Standard 0s Movement with Pillar Plate Reduced to 3/0s.

Manufacturer: Rockford ?
Manufacturer Location: Rockford, Illinois ?
Movement Serial Number: 935655 ?
Grade: 164 ?
Model: 1 ?
Estimated Production Year: 1914 ?
Run Quantity: 500 ?
Grade/Model Run: 2 of 2 ?
Grade/Model Total Production: 1,400 ?
Variant Est. Production: 500 (3/0S-M1-O) ?
Size: 3/0s ?
Jewels: 15j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
Railroad Grade: No ?
Case: Various ?
Run ID: 1328.164G6.S2.M2.O559.P324.15J305 ?
Data Research: 1907 Rockford Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (0.40%) ?
Research Note: #935616 and #935655: Verified as 3/0s. Run is likely mixed with 0s and 3/0s.