This Illinois Signamatic Power Reserve Model 9516. This is one of the only automatics produced by Illinois with a Swiss manufactured movement. Movement is an ETA caliber 1256 with 17 jewels with an incabloc shock system. The case is stainless steel with a screw back, and measures 31.5mm, 41mm with the lugs. The dial is signed with Hamilton and Illinois name. What makes this watch very interesting and collectable is the wind indicator on the dial, it says how many hours of mainspring tension remains. It tops out at 40 and will work its way to zero.