A Guide to Illinois Watch Co. size 12 watches, Grade 129.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Name
1
1931
5,469,401
5,469,600
200
O
19
Adj.
Illinois  '129'    
2
1931
5,469,701
5,469,900
200
O
19
Adj.
Illinois  '129'    
  Total
400
   
Grade 129 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 12/09/2015.
Grade 129,
19 jewels adjusted, manufactured in 1931 a total of 400 movements in 2 runs make up this grade. Model 3 open faced; bridge movements of medium
quality,  with double roller and patent micrometric regulator.

Observations,
The movements have bright striped pattern demaskeening, named Illinois and marked 129. Hamilton Watch Co., used an image of a 19 jewel grade 407
adjusted 3 positions in a 1930 factory advertisement, although the movements allocated to this grade were 127 parts with 2 cap jewels added to the
escapement and the 17 jewel mark changed to 19.  
 

Description,
19 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; Brequet hairspring; patent micrometric
screw regulator; safety screw center pinion; perfect self locking setting device; polished winding wheels; safety recoil click.
Images of both runs, notice the 7 in 17 jewels is converted to a 9 and the 9's in grade 129 are different sizes.