A Guide to Illinois Watch Co. size 12 Watches, Grade 415.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1927
4,951,301
4,951,680
380
O
17
Adj.
Illinois Watch Co. '415'
2
1927
4,251,801
4,252,000
200
O
17
Adj.
Illinois Watch Co. '415'
3
1927
4,959,001
4,959,100
100
O
17
Adj.
Illinois Watch Co. '415'
4
1927
4,959,301
4,960,000
700
O
17
Adj.
Illinois Watch Co. '415'
5
1927
4,961,001
4,961,400
400
O
17
Adj.
Illinois Watch Co. '415'
6
1927
4,961,401
4,961,500
100
O
17
Adj.
Illinois Watch Co. '415'
7
1927
4,961,501
4,962,000
500
O
17
Adj.
Illinois Watch Co. '415'
8
1927
4,968,001
4,969,000
1,000
O
17
Adj.
Illinois Watch Co. '415'
9
1927
4,973,001
4,973,600
600
O
17
Adj.
Illinois Watch Co. '415'
 
Total
3,980
 
 
Grade 415 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 12/22/2015.
Grade 415,
17 jewels adjusted, manufactured in 1927 a total of 3,980 movements in 9 runs make up this grade. Model 3 open faced bridge; movements of
medium quality, with double roller and patent micrometric regulator.

Observations,
The movements come in broad striped pattern deaskeening, named Illinois Watch Co., with 415 marked on the center bridge and have deco winding
wheels. The jewels on the balance cock are press fitted  showing the Hamilton influence, although all the movements are marked Illinois Watch Co.
they were advertised in the Hamilton 1928 catalog under Illinois Watch and sold as movements only.

Description,
17 jewels, oreide settings; adjusted to temperature; spring tempered compensating balance with timing screws; double roller escapement; hardened
and polished steel escape wheel; sapphire pallets; sapphire jewel pins; gold beveled and polished center wheel; Breguet hairspring; patent
micrometric screw regulator; safety screw center pinion; perfect self locking setting device; deco etch winding wheels; safety recoil click.
Image from run 8