Fishgill Necksash was live during Kunark, dropped in TD off a mob named First Mate Morgan 100% of the time apparently. It was a group of skeletons around Captain Cragg who dropped the Flowing Red Silk Sash.
According to what I've read it only was dropping for about a week.
Here's alla info.
And there's additional info on this page.
Would be cool if it could be replaced temporarily since I don't believe we ever had any on P99.