The 124G has gold plated flash contacts thus the "G". It also has more black and less chrome and possibly a different wind mechanism than the 124 as the sound in winding is different.
This is a steal. I'm on restrictions right so unfortunately I'm out. Grab it now before someone else does!
I have an early one of this model. Very robust camera, dead-reliable, and allegdely better build quality than the 124-series. My favorite walk-around camera.