My Epi Genesis has an impressed serial number too, 1000636. I never saw that as an indication of a US origin, but you live and learn. The "Epiphone" on the headstock face is an inlay though. Plus the neck is finned in balck just like the body. It has the same volute though and the tuners are identical too. One other difference that strikes me is the heel area is different, on yours it could have been intended for a bolt-on construction until someone changed his mind while mine has more of curved set neck look. Pups, bridge and controls are identical.
Yours reminds me a bit of the lower-cutaway-sawed-off G-3 teardrop prototypes Epi USA played with pretty much around the same time. Headstock logo is reminiscent of those.