Clint Eastwood - What movie will he be remembered for?

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This is a toughie!
I'll go with Dirty Harry but don't mean to slight his Westerns which were some of the best ever

As a director Unforgiven

Fist Full of Dollars

Maybe I should have made it for each decade.

Dirty Harry

Dollars trilogy
Dirty Harry
Gran Torino (possibly)

The Outlaw Josey Wales (1976)

I don't think it can be narrowed down to one, but if I have to, yeah it'd be Dirty Harry.

But also his many spaghetti westerns, Play Misty for Me, Gran Torino (he was excellent in that), and The Bridges of Madison County.