A Guide to Illinois Watch Co. size 12 Watches, Grade 121.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Name
1
1931
5,436,001
5,438,000
2,000
O
21
3 Pos.
Illinois Watch Springfield '121'    
2
1931
5,477,001
5,478,000
1,000
O
21
3 Pos.
Illinois Watch Springfield '121'    
3
1932
5,508,001
5,510,000
2,000
O
21
3 Pos
Illinois Watch Springfield '121'    
4
1932
5,548,001
5,549,000
1,000
O
21
3 Pos.
Illinois Watch Springfield '121'    
5
1932
5,565,001
5,566,000
1,000
O
21
3 Pos.
Illinois Watch Springfield '121'    
  Total
7,000
   
Grade 121 Runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder.
Last update 12/09/2015.
Grade 121,
21 jewels  adjusted to 3 positions, manufactured from 1931 to 1932 a total of 7,000 movements in 5 runs make up this grade. Model 1 open face; 3/4
plate movements of medium to high quality,  with double roller and patent micrometric regulator.

Observations,
The movements have bright lined pattern demaskeening, named Illinois Watch Springfield and marked 121. Although they included in a 1930
advertisement and sold as movements only, priced $38.00. The first production date with "121" on the movement was 1931, the grade looks to be a
continuation of grade 279 that ended production in 1930.

Variants,
Escapement jewels in the last two runs changed from screwed set to press fitted,

Description,
21 jewels, adjusted to temperature and 3 positions; compensating balance; double roller escapement; steel escape wheel; sapphire jewels; gold strata
beveled and polished center wheel; Brequet hairspring; patent regulator; safety pinion; concave and polished winding wheels; recoil click;
demaskeened in bright lined pattern.
image from last run.