A Guide to Illinois Watch Co. size 12 watches, Grade 435.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1918
3,268,701
3,268,800
100
O
17
Adj.
Illinois Watch Co.
2
1918
3,268,901
3,268,950
50
O
17
Adj.
Illinois Watch Co.
3
1918
3,388,351
3,388,360
10
O
17
Adj.
Illinois Watch Co.
4
1919
3,482,001
3,482,150
150
O
17
Adj.
Illinois Watch Co.
 
Total
310
 
 
Serial numbers used on this page by the kind permission of
Russell W Snyder
Grade 435 runs.
Last update 12/24/2015.
Grade 435,
17 ruby and sapphire jewels adjusted to 3 positions, manufactured from 1918 to 1919 a total of 310 movements in 4 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 first of the Extra thin models to be made and came in solid gold cases and were factory cased, with the low production figures it's
rare to find this model complete with original cases.

Description,
17 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; simple regulator adjustment; and safety recoil click.
Image from run 4.