I honestly cannot remember which Duke movie I saw first but it would have to be one of the following:
The Alamo.
The Longest Day.
Rio Lobo.
Big Jake.
True Grit.
Rooster Cogburn.
Definately one made after 1959 though. Also, when The Shootest came out in the theaters, I was too young to be allowed to buy a ticket to see it alone. I could not convince either parent to come back to the theater to buy a ticket and watch it. That was the only chance for me to see The Duke on the big screen.
I sure wish some multi-millionnaire would open a theater here in my area that only plays the older movie classics. I wonder if there is such a theater in San Antonio????????