Accepting that you may be new to grading (the coin is probably around GF), there is one other thing that would earn you a teensy slap across the wrist, and that is in describing the coin as 'rare' when it's nothing of the sort. The coin is perfectly collectable but your heading is likely to get collectors' backs up and result in a lack of trust. If you want help with grading, I'm sure there are plenty of people on here who will throw you a lifeline, juat post a picture before listing and we'll help out but as regards the description, if you are unaware of how rare the coin actually is, suggest you say nowt. Lecture over!  i was describing that coin with the what seems to be a die error as making it rarer, not a charles ii threepence as rare, but anyway thanks for the heads up