What is the material in the photo?

[Sorgmantel]

Hello!
What kind of paint do you think it is? The hole is about three cm at its widest and the flake felt brittle and flexible.
And what is the gray behind it? This is a window frame in a house built in 1965?

 

[TommyC]

Are you sure it's paint? It might possibly be plastic laminate if it's not paint.
https://sv.wikipedia.org/wiki/Plastlaminat
The underneath looks like plaster.

 

[Sorgmantel]

Are you sure it's paint? It might possibly be plastic laminate if it's not paint.
[link]
The underneath looks like plaster.

Ok, thanks for that! :-D