For your consideration, an Illinois 17s, Model 13, Sangamo Special, s/n 4642566, ca: 1925.

Sangamo Special;  3 Finger False Bridge, Red Engraving on Movement; Ruby, & Sapphire jewels in raised gold settings, oval top & bottom pallet jewels, sapphire jeweled barrel, gold balance screws, rounded & polished gold train wheels, gold guard pin, patent regulator; Motor Barrel; Double Roller; Unmarked 60 hour mainspring

Open Face, Double-sunk glass enamel bold Arabic dial, 14K Gold Filled Factory Case

Stem wind, lever set, adjusted to temperature, isochronism, and 6 positions.

The dial has visible hairlines and two chips, before 8 and after 1 (at the lever). The case is worn from use with visible brassing is at the top of the crown.  Refer to the pictures.

The watch sets, winds, and runs.  The watch has not been timed or checked for accuracy.  It is not known when it was last serviced.  

Please refer to all of the pictures as they are an integral part of the description.

No warranty is offered or implied.