Engine is in exactly as found condition- I have made zero attempt to clean it up in any way.  It certainly has been previously used and enjoyed- but I don't see abuse.  I'm sure with water and a dry fuel tablet it can be enjoyed again.  I am also sure it can be cleaned up a bit more should the new owner choice to put effort forward.  Such a fun way to remember time of the past!  I don't know the exact age of this piece- likely early 1970's (I think)