15thc perception on swallowtail merlons?

[MichelleL11]

Jessica Scott mentioned this building: You are not allowed to view links. Register or Login to view.
Any idea if they could be original?

According to this article, You are not allowed to view links. Register or Login to view.

The fortified Planta tower was erected around 960 to provide protection against barbarians threatening the empire of Otto I. It is considered the oldest fortified residential tower in the Alps. The swallowtail merlons and most windows were only added around 1500. Much of the convent museum is inside this tower.

So really not a good example if you believe the carbon dating.