Good Gravy almighty. If it is an orginal he's probably sitting on a million farking dollars.
He talked with a teacher who knew about them. His teacher told him about the italian models and what to look for. His teacher is somewhat convinced it's an original.
The originals were not stamped "Buntline Special."
And, the originals had folding rear sights, were intended to be used as revolving carbines, though were not furnished with the metal stocks. Also, they had hard rubber grips.
Notice, too, this gun is of the smokeless powder era, from the location of the cylinder pin latch screw. The original "Buntlines" of the Ninteenth Century were made on the blackpowder frames with the retaining screw insereted from the front of the frame, not crosswise.
If this is a true Colt, it is of later edition. Still, not too shabby in value. If condition warrants, maybe worth $1000.00 or so.