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From the American Horology Archive:
Illinois Watch Co.

Grade: 510

Mixed Run: "5 Positions 21 Jewels" and "6 Positions 23 Jewels"

Private Label(s) in Run:
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Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2386758 ?
Grade: 510 ?
Model: 4 ?
Estimated Production Year: 1912 ?
Run Quantity: 20 ?
Grade/Model Run: 1 of 7 ?
Grade/Model Total Production: 253 ?
Variant Est. Production: 20 (12/14S-M4-21J) ?
Size: 12/14s ?
Jewels: 21j Mixed Run ?
Jewel Material: Ruby ?
Jewel Setting: Raised Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Inlay Color: Gilt ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Double Roller: Yes ?
Barrel: Going ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Regulator: Reed ?
Hairspring: Breguet ?
Pallet Jewel Material: Ruby ?
Adjusted: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 20.5, 39.0, 55.0 ?
Case Screw Locations: 2.5, 35.5 ?
Case: Various ?
Run ID: 7462.510G1.S3.M3.O3246.P1287.21J478 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 3 (15.00%) ?
Research Note: Despire only being a run of 20 movements, this "Ariston" run is mixed with movements marked either "5 Positions 21 Jewels" or "6 Positions 23 Jewels," suggesting the first batch of 10 might have been finished with a slighly different quality than the last batch of 10.
#2386748: Verified as Marked "5 Positions" and "21 Jewels."
#2386758: Verified as Marked "6 Postiions" and "23 Jewels."