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From the American Horology Archive:
Illinois Watch Co.

Grade: 4

Railroader

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 703914 ?
Grade: 4 ?
Model: 2 ?
Estimated Production Year: 1887 ?
Run Quantity: 2,000 ?
Grade/Model Run: 2 of 3 ?
Grade/Model Total Production: 4,500 ?
Size: 18s ?
Jewels: 11j ?
Jewel Setting: Friction ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
Movement Signing Style: Block Letter ?
Movement Inlay Color: None ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going ?
Train: Coarse ?
Regulator: Chalmers ?
Hairspring: Flat ?
Standard Dial Type: Single-Sunk ?
Adjusted: No ?
Railroad Grade: No ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: 23.5, 51.5 ?
Movement Markings: Illinois Watch Co. [Train Engraving] Patent Pinion Adjusted ?
Case: Various ?
Run ID: 1445.4G3.18S1327.182M523.H632.L993.11J788 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 25 (1.25%) ?
$ Estimated Value (12 Month Change): -19.72% Analyzing 59 Sales ?
Research Note: #702951: Verified as Marked "Adjusted." However, the balance cock (with the "Adjusted" marking) appears inconsistent with other Grade 4 movements, suggesting it may have been swapped from another movement [JH].