I'm just ignoring the nastiness aimed at one of the less astute. Ya never see me doing that.
I love the bass, standup. The hat pegs were probably sawn off.
That wood is the original wood. They were originally, more than likely dyed black, as in most other older hat pegs. Somebody just didn't go for that, cut them down and sanded.
I like the way they look now, especially that they're full plates.
Most basses over 130 years, or so were originally three stringers, as Louis points out.
300 years IMO, is stretching the age.
Tyrolean shop bass would be my first guess.
Basses like this are very sought after, patucularly by jazz bassists, for thier open sound with pizz and arco. Good size to deal with and pretty damn hearty for their age.