I agree with floortrader:
"Not everything can be expertized on a computer screen"
If you have a perforated stamp from this series, you can compare it with the imperforated one.
You can check at a high magnification if the stamp shows the characteristics of a typo print - the edges of the drawing are straight and with a greater accumulation of ink and on the back of the stamp there are embossed traces due to the application of pressure.
I don't have 80Pf -Michel#77 but Michel#93.
Notice the edges of the letters "REICH" and the frame lines - they are definitely typo print.

