A buddy of mine has his dad’s 1920’s era Martin archtop. He plays slide on it. Definitely has that Robert Johnson sound.
Once had a chance to buy 2 very old relics but they didn’t take my $50 offer after telling me their history, the Grandfather built one and the other was still a mystery, instead of having bridge pins that went all the way through, the pins were just little wooden pegs that the holes didn’t go all the way through, Think it could of been a ‘gut string’ thing