Found this seat while clearing the garage roof at my mother's house.
Not even sure it is Honda although back in the late 70's I owned a CB450 Black Bomber so maybe from that model.
Looks like it should locate somehow at the front of the seat (2nd pic) with a bracket on the studs at the back to bolt the seat
in place, but also seems to have fittings for a metal support arm of some kind (3rd pic).
Cover doesn't look original, may or may not be correct pattern.
Any suggestions would be much welcomed!