That'd have been the crap low-budget ones, at most (I don't see why the Celts wouldn't have made a fair few el cheapo crap blades on the side of decent ones). Certainly not the quality any warrior able to afford decent armour would bother with. Think of the "fake Rolex" principle and apply it to young, dumb and boastful barbarian warriors in a macho culture where a long sword is a hardcore status symbol...