The confusion might have something to do with that wretched hive of scum and villiany called "watch collecting."

Counterfeit, replica, knockoff - copies trademarked branding, illegal, bad, could have product rightfully confiscated by customs.
Copy, "homage" - pretty much a design copy, down to some details, but different branding. Legal; owners of the real-deal may think less of those who purchase them.
True homage - has details with a nod to something someone else did in the past, but visually different in any number of details.
"Re-issue" - when a Big Company copies one of their own designs.

Brompton won a copyright case, because some idiot vendor copied their sales copy. Not because they made a bike exactly like a Brompton. Since their patent has expired, they might have recourse over trade dress, if they can convince judge/jury that the shape or mechanism of their fold constitutes essentially a trademark, but they need to have registered that IP in order to make that claim. Design patents offer even less time for protected sale than regular patents, however. And really, they can go after official distributors in the US and Europe, but in most of the rest of the world, including mail order to US/EU, it would be expensive and pretty much tilting at windmills, to argue their case.

There are those who argue that copies are certainly unethical, borderline illegal. OTOH, copies are absolutely legal, and the ethics should be viewed in light of why there are limits on IP.