Gooch---- Although I kind of doubt it, I am open to the possibility that Gregory XVII is an anti-pope as well.
From what i can tell it looks like he may very well have been re-elected in 1963.
That being the case, until a future Council( with the Placet of a true Pope ) settles the matter, i recognise him as Pope until 1989.
I consider the case stronger yet as he was the known favorite of Pius XII. :detective: :reporter: