Scabbards, covered in leather or NOT?

[markusaurelius]

I am of the belief that various swords did not have leather. An obvious type which would not need leather are the swords with a metal side brace/band running along the edge of the two scabbard halves. The metal which was nailed to the scabbard at various points would help hold and secure the pieces together. There seem to be enough original examples of sword with no leather to justify the existence or swords without a leather covering.