Original butt hinges are distinguishable from their modern counterparts because they are generally larger with fewer knuckles per hinge.
Main doors and internal doors to rooms (about 50 mm thick) were usually hung on a pair of five- knuckle steel butt hinges.
Lighter doors (about 32 mm thick) for cupboards or water closets were hung on a pair of three- knuckle steel butt hinges.
Ensure that you use brass screws rather than steel.
The external common stair door was usually self-closing, with a pin and offset crank hinge, while crook and band hinges of wrought iron were common on heavy outward-opening external and cellar doors.