Oh, so you took it off of a key lock, that makes sense with the size of the tab and hole in it. Still, considering the condition I don't think it's worth anything at all. Just because it says Rolls-Royce on it doesn't mean it's worth something. So is it sitting on a phone, iPad, or? Some reference for size would be helpful but if it is a key lock cover it would be about 3/4 of an inch in diameter. Is that plastic on it that is all cracked? I kinda think someone glued an old aftermarket key fob emblem onto the cover which I have seen before but not with any emblem on them. Rolls-Royce tended to downplay sticking their name all over the place on their cars, especially in those early days.