That's beautiful. And an interesting example of a 7-string with two short drone strings. More commonly there are 6 long strings and one short drone.
The decoration is not too dissimilar to that found on Tunbridge ware banjos made in Sussex in the mid-19th century. The headstock shape is quite different from those I've seen though. I don't think of these (typically English) 7-stringers as minstrel banjos, but more as regional hybrids adapted from minstrel banjos.
Tuning is usually, but not fixedly, GGCDGBD