This is a very interesting situation. I find it very amusing that companies that operate overseas ( the USA in this case ) use the same methods as they do locally, when chances are they have absolutely no idea how the law of another country ( the UK ) works, or even care about. eBay is no help in a case like this with USA customers, much less with customers in another country. Any company that feels threaten by the items you are selling on eBay will have their lawyer firm minions come after you with a Cease & Desist letter, which I believe is what you got in an e-mail? not even a hard copy, which should hint to how serious they are about this. All they can do is threat with action against you over something they do not even have proof of, so maybe you will cough up some money. You are completely safe, and have zero liability just because you are not in the USA. All this really comes down to is action vs. reward. These law firms will only sue when they are absolutely sure there is something in it for them, because the lawsuit process is VERY expensive , they will not even bother with international cases, unless there is hundreds of thousands to millions of dollars involved. If you ever get contacted again, redact a very sarcastic letter that basically tells them to shove it, I did and never heard from these as****es no more! Last thing, it may be time to go full stealth if you want to keep on selling this item.
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