Pocket Watch Database

Illinois Size 18s Model 4: Overview & Production

The 18-Size Model 4 was introduced in early 1890. The February 1890 issued of The Jewelers' Circular and Horological Review reported: "The Illinois Watch Co. having withdrawn from the National Association of Jobbers, will hereafter dispose of their movements through special jobbers in all parts of the country; so dealers who have heretofore been able to obtain this company's goods through association jobbers, can now have their wants promptly satisfied. The company has just placed upon the market, and have ready for delivery, an entirely new model openface 18-size pendant set movement. It has a straight line escapement, and the barrel is covered by a barrel bridge, which enables the watchmaker to readily remove the barrel and repair or put in a new mainspring."

Model 4 Features

Illinois Model 18s 4 Diagram

Movement Diagram

Illinois 18s Model 4 Sample Image

Example Image

Illinois 18s Model 4 Dial Plate Image

Dial Plate Image

Note: Diagrams and photos displayed are intended to serve as a represenation of this model.
Plate cut, finishing style, jewel count, regulator, and other features may differ between grades within the same model designation.
Size 18s
Configuration Openface
Plate Full
Setting Pendant
Finish Gilt or Nickel
Notes Introduced February 1890
Fine Train
Model 4 Image Gallery

Model 4 Technical Specifications

Movement Thickness (with dial): 12.57mm
Pillar Plate Diameter: 45.76mm
Core Diameter: 42.67mm
Weight (with dial and hands): 66.08g
Measurement Notes: Inner Pillar Plate: 42.67mm

Note: Measurements may vary slightly depending on features, style, and time of production.

These measurements were taken on movement #1100533.