What was this Buck's Head, and how did Tony direct the two men to it?

The Buck's Head is an inn.

TONY. You do, do you? then, let me see—what if you go on a mile further, to the Buck's Head; the old Buck's Head on the hill, one of the best inns in the whole county?

TONY. Mum, you fool you. Let THEM find that out. (To them.) You have only to keep on straight forward, till you come to a large old house by the road side. You'll see a pair of large horns over the door. That's the sign. Drive up the yard, and call stoutly about you.