There is a nice example of early style jazz mandolin on the Folkways label, now handled by the Smithsonian.
The band were the Six and Seven Eighths String Band of New Orleans, and they began their playing careers around 1912.
Folkways recorded some of them in 1949.
They are the only recordings of a New Orleans string band I know of. Are there any others?
I'll attach an mp3 of Tiger Rag