Silveroid 21 jewel pocket watch by Illinois circa 1924. Movement appears to be 16 size set in an 18 size case. Porcelain double-sunk dial with black Arabic numerals minut markers and subsidiary constant seconds register with hairlines and repair work in the lower section of the dial. approx. 18 size Keystone Silveroid screw back case and curvette in good condition. Illinois 21 jewel, 3 adjustment, double roller movement in working condition, serial number 4010259.