When I played Pinehurst # 2 in 1961-2-3, the greens were crowned. At the time I described them to third parties as open umbrellas. I still remember a 2-iron that I hit 8 feet into the back right pin location on the 2nd hole in a misting fog, and a woman, walking in the woods, in a rain slicker said it was the best shot she had seen since Jug Macspaden hit one back in 38 or whatever year she referenced. That green was very umbrella like.
The greens were not flat in the early sixties, but 40 years of topdressing, sandsplash, regrassing and rebuilding can change the topos.
I would think that Peter Tufts could provide pretty accurate information with respect to just about everything at Pinehurst.
My dad, who had been playing at Pinehurst before grass indicated that the greens had an umbrella shape to them when he played there