I'm looking at this add in Barnstormers: https://www.barnstormers.com/classified-1656298-1961-mooney.html?catid=20590 I spoke to the person selling it, and it's an M20B.  He says the paint is "a little rough but can be buffed out".  It was last current in 2019.  The battery is dead.  Sadly the owner passed from Covid.  I don't know when it was last flown, or the tail number.  It does have ADS-B so I think I can find out it's flight history?  It is not a very low time engine, and it has