Illinois, G.F. Open Face 'Sangamo Special' Pocket Watch, Circa 191548.00 mm case diameter, white double-sunk dial signed ILLINOIS, Arabic numerals with red and black outer chapter ring calibrated to 60 units, blued steel spade hands, subdial for seconds at 6 o'clock, guilloche engraved case with blank cartouche, stem wound and set 21 jewel nickel movement adjusted to temperature, isochronism and six positions signed ILLINOIS WATCH Co. SANGAMO SPECIAL. Movement number: 2790661.Inner case back stamp: PHILADELPHIA WATCH CASE CO TWENTY YEARS 9063628.Provenance: Property from a Midwest Collector