A Guide to Illinois Watch Co. size 12 Watches, Grade 528/400.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1921
3,869,301
3,870,000
700
O
21
5 Pos.
Illinois Watch Co. Illini.
2
1922
4,018,001
4,018,500
500
O
21
5 Pos.
Illinois Watch Co. Illini.
 
Total
1,200
 
 
1
1922
H1,001
H1,549
549
O
21
5 Pos.
Hamilton 400 [ Diplomat ]
2
1922
H1,550
H1,800
251
O
21
5 Pos.
Hamilton 400 [ Diplomat ]
 
Converted Total
800
 
 
1
1930
H2,001
H2,010
10
O
21
5 Pos.
Hamilton 400  [ Tycoon series ]
2
1931
H2,011
H2,510
500
O
21
5 Pos.
Hamilton 400  [ Tycoon series ]
3
1932
H2,511
H3,500
990
O
21
5 Pos.
Hamilton 400 [ Tycoon Series ]
 
Total
1,500
 
 
Grade 528 & 400
Serial numbers used on this page by the kind permission of  
Russell W Snyder
Grade 528.

Grade 528; 21 ruby & sapphire jewels adjusted to 5 positions, manufactured from 1920 to 1921 a total of 1,200 movements in 2 runs make up this
grade. Model 2XT size 12 open face; bridge movements of high quality, with patent Delong click, Illinois superior jeweled barrel,
double roller and mostly simple regulator.

Observations  

The movements have broad striped pattern, named Illinois Watch Co. Springfield, Illini: 21 Jewels on the bridge with 5 positions on the balance cock.
The jewels are burnished set on the bridges, with a recessed gold plate on the escape cap jewel and screwed set jewels on the balance. A pallet cock
is fitted. Silver snap on bezel dials were fitted, four type of cases models were advertised, Dictator made by Keystone; plain Bassine; made by
Solidarity and Empire and Directoire thought to be made by Knapp all in 14K gold.
Grade 528 movement from the first run
Grade 400 Tycoon Series.

Grade 400 Tycoon; 21 ruby & sapphire jewels adjusted to 5 positions, manufactured from 1930 to 1932 a total of 1,500 movements in 3 runs. (Made
from Illinois XT parts) open face; bridge movements of high quality, with patent Delong  click, Illinois superior jeweled motor barrel, double roller and
patent regulator.

Observations

The movements have broad striped pattern, named Hamilton Lancaster Pa., 21 Jewels 5 positions; Grade 400 on the bridges.The jewels are
burnished set on the bridges with press fitted jewels on the escapement and balance. A pallet bridge is fitted. Silver snap on bezel dials were fitted,
four types  of case models were advertised, Bok, Carnegie, Nobel and Pulitzer in 18K gold and marked Hamilton W. Co., Eton 14K gold filled cases
made by Wadsworth were used for the service award watches.
Grade 400 Tycoon Series movement made from XT Illinois parts.
Description.

21 extra quality ruby and sapphire jewels; special tempered compensating centre arm balance, having gold screws including timing screws; adjusted to
temperature and five positions and isochronism; Berguet 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.
Grade 400 Diplomat.

Grade 400 Diplomat; 21 ruby & sapphire jewels adjusted to 5 positions, manufactured from 1929 to 1930 a total of 800 movements in 2 runs.
(Converted from grade 528) open face; bridge movements of high quality, with patent Delong click, Illinois superior jeweled motor barrel, double roller
and patent regulator.

Observations

The movements have broad striped pattern, named Hamilton Lancaster Pa., 21 Jewels 5 positions; Grade 400 on the bridges.
The jewels are burnished set on the bridges with a recessed gold plate on the escape cap jewel and screwed set jewels on the balance, A  pallet cock
is fitted. Silver snap on bezel dials were fitted, from records so far  some were sold in 18K gold cases and Eton 14k gold filled cases made by
Wadsworth were used for the service award Watches.
Grade 400 Diplomat movement converted from grade 528
Last update 12/24/2015.