Most at least of the Steven's made guns sold by Western Auto carried the Revelation name. Mark is correct that Western Arms was a name used by Ithaca. Frame was made of what is known as Malleable Iron. I believe this is cast but is different than ordinary cast iron.

A former co-worker had one of these in .410, but not sure about parts interchangeability with the Nitro Special. They are indeed very similar guns.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra