Kronos-WoW is a server by Twinstar.cz, and they offer a realm called Kronos 3 (III).
It used to be one of the largest Vanilla WoW Private Servers, but have decreased in population. There’s however still plenty of people online (estimated to be around 100-500).
Kronos III cares about being blizzlike, so they run on 1X rates. Feedback is that it’s a quality server.