
I take my word back.
GP E04C0 aka 8020 is certainly not just an ETA 7750. Not only does it have two column wheels, but also twin barrels, one of which is for the foudroyante. It's a very different and unique movement of its own, though no dispute it is based on 7750. As I know and have said, GP provided technical help to Jaquet SA to create this movement, later used by other brands. So to some extent it is more or less like an in-house movement. I definitely hold high regard of GP, especially this particular watch.