This is a very nice watch, running like it should.
I took the following from Illinois identification site:

Manufacturer:Illinois
Manufacturer Location:Springfield, Illinois
Movement Serial Number:5390789
Grade:163 Bunn Special
Variation:163 Type I
Model:14
Estimated Production Year:1930
Run Quantity:1,000
Grade/Model Run:5 of 6
Grade/Model Total Production:4,600
Size:16s
Jewels:23j
Jewel Setting:Raised Gold Settings (Screw-Set)
Movement Configuration:Openface
Movement Finish:Nickel
Finish Pattern:Ray
Movement Signing Style:Mixed
Movement Inlay Color:Red
Movement Setting:Lever
Plate:3/4 Plate
Double Roller:Yes
Barrel:60-Hr. Motor
Train Material:Gold
Center Wheel Material:Gold
Regulator:Reed
Adjusted:Yes
Adjusted # of Positions:6
Adjusted to Temperature:Yes
Adjusted to Isochronism:Yes
Railroad Grade:Yes
Dial Feet Locations:17.5, 39.0, 58.0
Case Screw Locations:3.0, 38.0
Movement Markings:Sixty Hour
Bunn Special
Illinois Watch
Springfield
163
Motor Barrel
23 Jewels
Adjusted
Temp. and
Six
Positions
Double Roller
Case:Various

On Jul-13-26 at 20:41:14 PDT, seller added the following information:

All of the watches I am putting on are very nice running watches.