Leung Tien Chiu was born in 1878 & died in 1972. He was taught Se Ying Diu Sau (Snake Form Artful/Mongoose Hands) by Leung Sil Jong. There is no verified video of this art I am aware of. I would guesstimate that Leung Sil Jong was born in 1820s. It is speculation as to who he learned under, it is presumed that he learned this method from, whom would later be considered, the founder of Choy Gar. It is said to come from the Choy family & that the original name is Se Ying Diu Sau the forerunner of Choy family boxing. Leung Bok Chou is said to have been a student of the Choy family as well, prior to learning Wing Chun. Time frames fit.