A Guide to Illinois Watch Co. size 12 Watches, Grade 507.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1911
3,745,001
3,746,000
1,000
O
19
3 Pos.
Hallmark  [ made for United  Jewelers ]
  total
1,000
   
Grade 507 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Last update 12/24/2015.
Grade 507,
17 ruby and sapphire jewels adjusted 3 positions, manufactured from 1911 a total of 1,000 movements in 1 run make up this grade. Model 4 size
12/14 open faced; bridge movements of medium quality, double roller and patent micrometric regulator.

Observations,
The majority of movements have broad striped pattern demaskeening named Hallmark. The size 12/14 movements have a size 12 bridges and size
14 pillar plate and have a stretched enamel dials that are not recessed into the pillar plate, they require special cases. Hallmark watch were made for
United Jewellers and came factory cased with The Hallmark Watch on the cuvette.

Description,
19 ruby and sapphire jewels; oreide settings; adjusted to temperature and 3 positions; spring tempered compensating balance with timing screws;
double roller escapement; hardened and polished steel escape wheel; sapphire pallets and jewel pin; polished gold center wheel; patent Breguet
hairspring; micrometric screw regulator; safety screw center pinion; concave and polished winding wheels; safety recoil click; demaskeened broad
striped pattern; gold inlay engraving; unusally large dial is a special feature of the watch.
Image of this grade.