Ian Grant
Well I wonder were the G is added in the 124G, apart from the luxury all black finish, with some plastic, it's the G - Gold plated contacts that are the major difference 
The shutter speed wheel should interact so that when the meter's functioning the meter's pointer moves when the wheel is rotated. My needle mechanism had stuck, so while still responding to light it never went past half way even when pointing at direct sunlight
In fact altering the shutter speed made no difference to the meter, it must have just been stuck, perhaps a knock while in my backpack or on a flight.
Ian

The shutter speed wheel should interact so that when the meter's functioning the meter's pointer moves when the wheel is rotated. My needle mechanism had stuck, so while still responding to light it never went past half way even when pointing at direct sunlight

Ian