A Guide to Illinois Watch Co. size 12 Watches, Grade 504.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Run.
Date
From
To
Total
H/O
Jls
Adj.
1
1914
2,640,201
2,640,600
400
O
17
Unadj.
10
1916
3,002,201
3,003,000
800
O
17
Unadj.
2
1914
2,671,001
2,671,200
200
O
17
Unadj.
11
1918
3,242,501
3,243,000
500
O
17
Unadj.
3
1915
2,799,521
2,799,530
10
O
17
Unadj.
12
1918
3,382,401
3,382,800
400
O
17
Unadj.
4
1916
2,889,301  
2,889,600
300
O
17
Unadj.
13
1918
3,401,401
3,401,500
100
O
17
Unadj.
5
1916
2,896,701
2,897,000
300
O
17
Unadj.
14
1919
3,468,401
3,468,800
400
O
17
Unadj.
6
1916
2,901,001
2,901,300
300
O
17
Unadj.
15
1919
3,509,001
3,509,700
700
O
17
Unadj.
7
1916
2,901,901
2,902,000
100
O
17
Unadj.
16
1919
3,537,301
3,537,700
400
O
17
Unadj.
8
1916
2,905,001
2,905,400
400
O
17
Unadj.
17
1920
3,618,001
3,618,700
700
O
17
Unadj.
9
1916
2,998,501
2,999,000
500
O
17
Unadj.
  Total
6,510
 
Name
H/O
Estimate
Name
H/O
Estimate
Illinois
17 Jewels O.F.
500
Hallmark [made for United Jewelers]
17 Jewels O.F.
5,900
 
         
Grade 504 Movements found to date.
Serial numbers used on this page by the kind permission of  
Russell W Snyder
Grade 504 Runs.
Last update 01/01/2016.
Grade 504,
17 ruby and sapphire jewels unadjusted, manufactured from 1914 to 1920 a total of 6,510 movements in 17 runs make up this grade. Model 4 size
12/14 open faced; bridge movements of medium quality, double roller and patent micrometric regulator.

Observations,
The majority of movements have broad striped pattern demaskeening named Hallmark. The remainder are bright striped pattern and named Illinois.
The size 12/14 movements have a size 12 bridges and size 14 pillar plate and have a stretched enamel dials that are not recessed into the pillar
plate, they require special cases.

Description,
17 ruby and sapphire jewels; oreide settings; spring tempered compensating balance with timing screws; hardened and polished steel escape wheel;
sapphire pallets and jewel pin; polished gold center wheel; patent Breguet hairspring; micrometric screw regulator; safety screw center pinion;
concave and polished winding wheels; safety recoil click; demaskeened broad striped pattern; gold inlay engraving; unusually large dial is a special
feature of the watch.
Image from last run.