Jack Allison's discussion of the Hartzell AD for his Arrow has gotten me
to thinking.
What aircraft do you fly/have you flown/do you have first hand knowledge
of which have a red zone somewhere in the green arc of the tachometer?

For example, I know there are/were certain models of Cessna 210's that
had such markings, but I cannot remember the specific models/engine/prop
combinations.