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From the American Horology Archive:
Illinois Watch Co.

Grade: Sangamo

Mixed Run: Nickel and Two-Tone Movements

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 1420581 ?
Grade: Sangamo ?
Model: 5 ?
Estimated Production Year: 1898 ?
Run Quantity: 300 ?
Grade/Model Run: 3 of 111 ?
Grade/Model Total Production: 26,135 ?
Variant Est. Production: 2,150 (16S-M5-23J-T) ?
Size: 16s ?
Jewels: 23j ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Two-Tone ?
Finish Pattern: Wavy ?
Movement Signing Style: Serif (Decorative) ?
Movement Inlay Color: Black ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Barrel: Going ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Regulator: Micrometric ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 6 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 24.5, 36.5, 55.5 ?
Case Screw Locations: 3.5, 37.5 ?
Movement Markings: Sangamo Illinois Watch Co., Springfield 23 Ruby Jewels Adjusted Temperature 6 Positions Isochronism Safety Pinion Double Roller ?
Case: Various ?
Run ID: 3737.G6.16S599.165M147.O1225.L2874.23J8 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 10 (3.33%) ?
$ Estimated Value (12 Month Change): -0.21% Analyzing 638 Sales ?
Research Note: #1420581: Verified as Featuring Two-Tone Finish (Wavy) . #1420593: Verified as Featuring Nickel Finish ("Bright-Spotted") [NAWCC].