Back in the day, there was no such thing as a "reverse hyper", "45 degree back extension bench", or a "glute-ham bench" - there was simply the "Roman Chair". You didn't do "back extensions", you did "hyperextensions" (yes, I understand the difference in execution the terms imply however, in how people actually executed the movements, there is no difference).
It was (and still is) a great, great exercise. Underrated. These days, I use my glute-ham bench for hyper... er, excuse me, back extensions more often than glute-ham raises (though I like both).
Greg Everett of Catalyst Athletics wrote the following post on the exercise: Back Extension(s)