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.
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This is a steal. I'm on restrictions right so unfortunately I'm out. Grab it now before someone else does!
All this has happened before, and all this will happen again.
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.