A rapier, manufactured in the century by the technology of the old masters as a gift to one high-ranking person. Such exceptionally flexible rapiers were made in Toledo in the beginning of century. They were sold in gun shops and coiled.
'Wheel of Time' Blade Master's Heron Mark Sword, By Robert Jordan. I had one of these blades in my collection years ago, but it went to someone else in the Great Property Divide of I really want one back in my collection again.