Ebony And Brass Sea Captain’s Navigational Octant Consign Now DeptMaritime ArtsSize17 ¼ in. x 14 ¾ in. Sold for $889 Ebony And Brass Sea Captain’s Navigational Octant, early 19th Century, with engraved ivory increment panel and “F. Arthur”, owner’s panel. 17 ¼ in. x 14 ¾ in. Please note that this auction has ended. Click here for an overview of this auction.