50.00 mm case diameter, white double-sunk dial signed ILLINOIS, black Arabic numerals with red and black outer chapter ring calibrated to 60 units, blued steel hands, subdial for seconds at 6 o'clock, patterned bezel, polished case back, polished cuvette, stem wound and lever set 23 jewel nickel movement adjusted to temperature, isochronism and six positions with gold center, double roller and gold setting screws signed SANGAMO SPECIAL ILLINOIS WATCH CO.
Movement number: 4720493.
Inner case back: Wadsworth QUALITY 14 KARAT GOLD FILLED PAT'S PEND'G 7556254.
Cuvette stamp: Sangamo Special GOLD FILLED WADSWORTH QUALITY.