TAB available https://www.daddystovepipe.com/tabs-for-free-youtube-lessons.php
Open G tuning DGDGBD (low to high).
My variation ows not just to Mississippi Fred McDowell but likewise to Mike Dowling’s outstanding variation https://www.youtube.com/watch?v=1q7l8rphvDU.
I’m playing the “Louisiana” design of “Delta Resonator Guitars”, made by John Alderson in the UK.