It's not a copyright violation, but if you'd feel better running back down to Mexico to pay the old man who made the sword, feel free. I dare say, that if you made a real sword that looked exactly like the original and sold it by the dozens, you still would not be violating a copyright. That sword design isn't even Mexican in origin, chances are that the maker copied it from somewhere too. It's nice to see you are so conscientious about copyrights, but you're getting a little carried away here.