The predecessor to modern sport Muay Thai fighting was Muay Kard Chuek- fighters fought using only hemp wrappings around their knuckles. There were other differences too, like the absence of a ring and rounds. Kard Chuek style fights still happen in Thailand and Burma, but these days include the modern round system and boxing ring.
You may remember that our Ajahn Suchart came out of retirement at the age of 53 for one of these fights in Chiang Mai last year.
Here is a fight from one of the Thai Fight promotion's Kard Chuek series. It features current Muay Thai champion Saiyok against the formidable Youssef. It's a pretty good fight...Enjoy!