Way to vague a question. For example a coin could have been dipped 50 years ago and then put into circulation and is now so worn, impossible to tell. A coin dipped a few years ago but then dropped into a pile of dirt for a few years too would not be noted as dipped. Some coins get put into washing machines by mistake, some are dropped into wishing wells and lots of other things that happen to coins. Attempting to tell if any coin has ever been cleaned, dipped, polished depends on so many things.























