There are barn finds,
and then there are those sort of finds where the metal is going back to where it came from!
Looks like this guy was having a joke.
If you can chip the limescale off the glass it maybe good
Bit like that one on Ebay which they strimmed all the weeds away so you can see the rust and accident damage, which probably is the reason it was left there to rot.
Shame for any car to be left to get to that state.