vinnie, I'm not that well travelled. The original as far as I know was Thomas's at Riv. Perhaps it is modelled in concept to a pot bunker that isn't exactly on the official green at TOC or another old links course, but the manner of the turf there makes it look like the middle of a green, maybe like Shell bunker at the Eden. I really don't know. The only two other bunker in the middle greens I can think of are Axeland and Proctor's very good one at Bayside in Ogallala. It is a real beauty. Then, the bunker in the green on the Nicklaus course in Hawaii (can't think of course name...)
But, I'd bet there are others. The ideal is so unique, and singularly distinctive, that if done elsewhere, I believe it is a copy of the original idea, making it in my mind a template.
But, there are lots of boomers. All of them have various orientations, as far as what position on the clock that the bunker causes the boomer green to surround. Most of them are near the front. But, like #7 at Crystal Downs, some are around the side. Hanse-Shackelfords Rustic Canyon #13, Sand Hills #8, Lions' mouth #16 CCofC, Whistling #6, are some that come to mind.