In 1936 Sam and his brother Lonnie made twelve recordings as the Chatman [sic] Brothers; Sam did not record again for twenty-four years. During that time he worked as a farmer, a night watchman, and a plantation supervisor.
In 1960 Chris Strachwitz rediscovered Chatmon and recorded him; four of the songs recorded were included on the Arhoolie LP I have to paint my face. In 1966 he was rediscovered again by the blues enthusiast Ken Swerilas, who persuaded him to move to San Diego, where he began playing in clubs and became a local favorite. Soon he was performing around the country at folk festivals and clubs, gaining notoriety as one of the few surviving first-generation Mississippi bluesmen. He made his last professional appearance at the 1982 Mississippi Delta Blues Festival.
This according to “Chatmon, Sam” by Andrew Leach (Encyclopedia of the blues II  p. 195); this encyclopedia is one of many resources included in RILM music encyclopedias, an ever-expanding full-text compilation of reference works.
Today is Chatmon’s 120th birthday! A discography is here. Below, ca. 1978.