Cool stuff found on this subject. Like the title, Tuhon, was used back in 1970's before it was known in the filipino martial arts community by Pamana Tuhon Sayoc. Sayoc Kali was founded and created by Pamana Tuhon Chris Sayoc. Timeline dates certain events from 1959 to 2014. I also added the history of Sayoc Kali on my page. Check it out.