A GREAT HAMILTON FOR THE ELECTRIC REPAIR GUY, I DID NOT TRY A BATTERY SO I DO NOT KNOW IF IT IS WORKING, I'M SURE IT NEEDS A FULL SERVICE BY A WATCHMAKER, THE CASE IS IN VERY GOOD CONDITION, IT MEASURES 35.5MM IN DIAMETER NOT COUNTING THE CROWN AND 44MM LUG TO LUG, THE BEZEL ON THIS MODEL IS 14K SOLID GOLD!!! EXCELLENT CASE AND DIAL.