With very little in the description, I nor anyone else would have much to go on in the way of knowing what the reason was. Please don't read ill intent into my suggestion. It is just that - a suggestion. :)
No sweat. :) Coming up with listing text can be tedious. The best thing I've found for the occasional lister is just to list everything basic (and boring) about it. In the case of a coin, putting the country, currency name and denomination (both of these spelled out), and year in the title should suffice to give bidders the most basic knowledge of what you're offering, and is good for those doing keyword searches. Best of luck!