Such a beauty! This is a stunning antique Shaker-style turned wood bowl with threaded handle, the likeness of which I have seen described as an apothecary mortar for preparing herbs and as a measuring cup, both of which make perfect sense. Because it is so beautiful, I would probably not use as pestle on it, but might rather be inclined to keep on a butcher block or tray in the kitchen, filled with sea salt or fresh herbs of which I might take a pinch as needed. In near perfect condition, its got a beautiful shape and finish and it just a truly lovely--I'd venture to say perfect!--thing. 

Overall: 4 3/4" tall, 6 1/4" wide; the bowl itself measures 4 1/4" in diameter and 1 3/4" tall. Excellent condition.