yaktx,the 120 volt meters have a jumper on the second & third terminal. one of the potential coils leads hooks to the first screw on the left then the other to the jumper. on the 120 volt meter yu have only one current coil.the 240 volt meter has two current coils,the potiental coils leads are hooked to the first two screws.the current coils are arranged so that one of each is hooked on the first two screws,then ends on the last two.you are correct about a 240 volt meter being slow on 120, but usually this is not a problem for some people.the meter in this thread is hard to say looks to be a 240 volt unit possibly. most A base meters are lie on the left & load on the right.but there are a few exceptions with some of the old westinghouse meters.
