By this example is the chain still present about which Mr. Domenech write in his answer to Norman about his shown knife short time ago:
"You can observe that there is a little hook in the end of the sheath hook. Also there is a small hole in the decoration of the tip of sheath called "batiente" in Spanish.
This is so because this type of knives had a small chain going permanently attached to the hole in the extreme of sheath and other end of chain had a small ring to hung on the little hook.
This was a custom only used in Brazil to secure the sheath to the belt and avoid loosing the knife while riding a horse. Rarely the chain is still present in these old knives today but some knives still have them."
Here the thread:
http://www.vikingsword.com/vb/showthread.php?t=28532
Sadly is only one side pictured. Soon as I have received it I will post more pictures.