[VVV]

I have seen it on a few regular sikin panjang-scabbards.
Unfortunately I can't publish my personal reference pictures from private collections here but Artzi has a couple of "public" examples:

http://www.oriental-arms.com/photos.php?id=35
http://www.oriental-arms.com/item.php?id=2621
http://www.oriental-arms.com/item.php?id=2335
http://www.oriental-arms.com/item.php?id=2211
http://www.oriental-arms.com/item.php?id=2962
http://www.oriental-arms.com/item.php?id=2236

Michael