A Guide to Illinois Watch Co. size 12 watches, Grade 275.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Run.
Date
From
To
Total
H/O
Jls
Adj.
1
1916
3,016,001
3,018,000
2,000
O
21
T & Pos.
24
1920
3,752,001
3,753,000
1,000
H
21
T & Pos.
2
1916
3,024,001
3,025,000
1,000
H
21
T & Pos.
25
1920
3,755,001
3,757,000
2,000
O
21
T & Pos.
3
1916
3,038,001  
3,039,000
1,000
O
21
T & Pos.
26
1921
3,816,001
3,818,000
2,000
H
21
T & Pos.
4
1916
3,054,001
3,055,000
1,000
O
21
T & Pos.
27
1921
3,835,001
3,837,000
2,000
O
21
T & Pos.
5
1917
3,058,001
3,059,000
1,000
H
21
T & Pos.
28
1921
3,838,001
3,839,000
1,000
O
21
T & Pos.
6
1917
3,069,001
3,071,000
2,000
O
21
T & Pos.
29
1921
3,875,001
3,877,000
2,000
O
21
T & Pos.
7
1917
3,153,001
3,154,000
1,000
H
21
T & Pos.
30
1921
3,911,001
3,912,000
1,000
H
21
T & Pos.
8
1917
3,183,001
3,184,000
1,000
H
21
T & Pos.
31
1921
3,927,001
3,928,000
1,000
O
21
T & Pos.
9
1917
3,218,001
3,220,000
2,000
O
21
T & Pos.
32
1921
3,975,001
3,977,000
2,000
O
21
T & Pos.
10
1917
3,238,001
3,238,400
400
O
21
T & Pos.
33
1923
4,198,001
4,200,000
2,000
O
21
T & Pos.
11
1918
3,398,001
3,399,000
1,000
H
21
T & Pos.
34
1923
4,242,001
4,242,500
500
O
21
T & Pos.
12
1919
3,434,001
3,436,000
2,000
O
21
T & Pos.
35
1923
4,242,501
4,242,700
200
O
21
T & Pos.
13
1919
3,438,001
3,439,000
1,000
H
21
T & Pos.
36
1923
4,242,701
4,243,000
300
O
21
T & Pos.
14
1919
3,476,001
3,476,600
600
O
21
T & Pos.
37
1923
4,300,001
4,301,000
1,000
O
21
T & Pos.
15
1919
3,502,001
3,503,000
1,000
H
21
T & Pos.
38
1923
4,329,001
4,330,400
1,400
O
21
T & Pos.
16
1919
3,523,001
3,524,000
1,000
O
21
T & Pos.
39
1923
4,330,401
4,331,000
600
O
21
T & Pos.
17
1919
3,548,001
3,549,000
1,000
O
21
T & Pos.
40
1924
4,533,001
4,534,000
1,000
O
21
T & Pos.
18
1919
3,570,001
3,571,000
1,000
H
21
T & Pos.
41
1925
4,620,001
4,621,700
1,700
O
21
T & Pos.
19
1920
3,620,801
3,621,000
200
O
21
T & Pos.
42
1925
4,621,701
4,622,000
300
O
21
T & Pos.
20
1920
3,627,001
3,628,000
1,000
O
21
T & Pos.
43
1925
4,666,001
4,668,000
2,000
O
21
T & Pos.
21
1920
3,671,001
3,673,000
2,000
O
21
T & Pos.
44
1928
5,005,001
5,006,000
1,000
O
21
T & Pos.
22
1920
3,,676,001
3,677,000
1,000
H
21
T & Pos.
45
1929
5,208,001
5,208,200
200
O
21
T & Pos.
23
1920
3,721,001
3,722,000
1,000
O
21
T & Pos.
  Total
52,400
 
Name
H/O
Estimate
Name
H/O
Estimate
Burlington Watch Co.
21 Jewels H.
13,000
Burlington Watch Co.
21 Jewels O.F.
39,400
 
         
Grade 275 Movements found to date.
Grade 275 Runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 12/24/2015.
Grade 275,
21 jewels adjusted to temperature and positions, manufactured from 1916 to 1929 a total of 52,400 movements in 45 runs make up this grade. Model
3 open faced and model 4 hunter; bridge movements of high quality, with double roller and patent micrometric regulator. Open faced 39,400 in 33
runs and Hunter 13,000 in 12 runs.

Observations,
The movements have broad striped pattern demaskeening, a choice of gold strata cases and various dials were offered and sold as mail order
watches by the Burlington Watch Co., of Chicago. Burlington Watch Co. Chicago is marked on the pillar plate, with double roller on the escapement
bridge. Dials are not recessed into the front of the pillar plate and stretched dials are fitted.

Description,
21 jewels, adjusted to temperature and positions; double roller escapement; compensating balance with timing screws, Steel escape wheel; Breguet
hairspring; micrometric screw regulator and adjusted to heat, cold and isochronism.
Image of an open faced movement.