A guide to Illinois Watch Co. size 12 watches, Grade 437
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1918
3,268,801
3,268,900
100
O
19
3 Pos.
Illinois Watch Co.
2
1918
3,269,801
3,269,900
100
O
19
3 Pos.
Illinois Watch Co.
3
1918
3,388,361
3,388,370
10
O
19
3 Pos.
Illinois Watch Co.
4
1919
3,482,151
3,482,400
250
O
19
3 Pos
Illinois Watch Co.
5
1920
3,650,201
3,650,600
400
O
19
3 Pos.
Illinois Watch Co.
6
1920
3,761,401
3,761,800
400
O
19
3 Pos
Illinois Watch Co.
7
1921
3,885,601
3,886,000
400
O
19
3 Pos.
Illinois Watch Co.
8
1921
3,904,001
3,904,400
400
O
19
3 Pos.
Illinois Watch Co.
 
Total
2,060
 
 
Grade 437 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 02/19/2015.
Grade 437,
19 ruby and sapphire jewels adjusted to 3 positions, manufactured from 1918 to 1921 a total of 2,060 movements in 8 runs make up this grade. Model
1XT open faced; bridge movements of high quality with Illinois superior motor barrel, double roller and simple regulator.

Observations,
The movements have brushed nickel pattern and all named Illinois Watch Co. They have burnished set jewels on the bridges and silver snap on bezel
dials. This was the second of the Extra thin models to be made and came in solid gold and gold filled cases and were factory cased,

Description,
19 ruby and sapphire jewels; adjusted to heat, cold and isochronism; has a specially quality tempered and hardened compensating balance; double
roller escapement; steel escape wheel; gold center wheel; Breguet hairspring; Illinois superior motor barrel; simple regulator adjustment; and saftey
recoil click.
Image from run 6.