The Prince Classic, or when it came out Prince, was made in like 1974 to start. It was very, very flexible. The Prince Pro came out a couple of years after and was intended to address the criticisms of the Classic.
I had hit with the Classic and thought it unplayable. When I tried the Pro, it was at least playable albeit way more powerful than the Kramer ProStaff I was using. The Pro was my first OS racquet and I stuck with it for about a year from 1982 - 1983. I graduated college and bought a Prince Graphite because I had the "wants" real bad.
All in all, the Graphite was probably the ultimate, but I distinctly remember canning it because I couldn't serve with it. From there, I went to the PK Silver Ace.
Volkl C10 Prince Warrior Touch Hybrid @ 49