Scabbards, covered in leather or NOT?

[Medicus matt]

As well as metal slides having integral lugs to secure them, some are fastened with pins (not rivets, how do you think that you'd be able to peen the rivets inside the scabbard) which are bent over inside the scabbard (I do this buy having an iron bar inside the scabbard when I'm driving the pin through which bends it, just like the archaeological examples) and some are lashed down like the one shown in Robert's picture (some organic slides are pierced to allow the binding material to pass through them.
Whether lashed down onto wood, leather or textile, I'd imagine that some sort of adhesive was also used.