Verification request: Eburones (Belgic tribe) gallic AR unit "rainbow cup" ~1AD

Bought this at a recent small auction for €100. Someone else mentioned it's an "official museum replica" rather than genuine.

Since my expertise is mostly in Romans, I must admit I'm sort of out of my depth with this one. It's not ferromagnetic and the weight checks out at 3.76g, but I am concerned about some of the surface marks.

I hope someone with some more knowledge in these can weigh in and help verify (or not) the authenticity.