Antique miniature dividers

A beautiful miniature pair of dividers.Possibly for leatherwork?

Brass and steel, with a bone handle. 3 3/4" overall length. 

I love this little tool. So nicely made, with a tiny brass nut to hold the handle in place. The handle is cracked but in my view it just adds to the character. It looks as if it would be possible to undo the nut, and replace, but honestly, why would you.