A guide to Illinois Watch Co. size 12 watches, Grade 538.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1919
3,517,001
3,517,900
900
O
21
5 Pos.
Illinois Watch Co. Illini
2
1920
3,649,001
3,650,100
1,100
O
21
5 Pos.
Illinois Watch Co. Illini
3
1921
3,868,001
3,869,000
1,000
O
21
5 Pos.
Illinois Watch Co. Illini
4
1921
3,869,101
3,869,200
100
O
21
5 Pos
Illinois Watch Co. Illini
 
Total
3,100
 
 
Grade 538 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 12/24/2015.
Grade 538,
21 ruby and sapphire jewels adjusted to 5 positions, manufactured from 1919 to 1921 a total of 3,100 movements in 4 runs make up this grade.
Model 1XT size 13 open faced; bridge movements of extra high quality with patent DeLong 5 tooth click, Illinois superior motor barrel, double roller
and simple regulator.

Observations,
The movements have broad striped pattern and named Illinois Watch Co. Illini. They have burnished set jewels on the bridges and silver snap on
bezel dials. This was the second of the Extra thin size 13 models to be made and came in solid gold and gold filled cases, they were factory cased.
Knapp, Solidarity and Wadsworth were some of the case makers in 14 and 18K gold and gold filled some with enamel trim, private label dials were
fitted to some movements.

Description,
21 extra quality ruby and sapphire jewels; special tempered compensating center arm balance, having gold screws and timing screws; adjusted to
temperature, 5 positions and isochronism; Breguet hairspring; double roller escapement; hardened and polished steel escape wheel; patent Illinois
superior motor barrel, both pivots of the barrel staff operating in sapphire jewels; patent recoil bar and pinion click; concave and polished winding
wheels; perfect pendant setting mechanism of exceptional simplicity entirely in movement; snap on bezel dial.
Image from 2nd run.