6 "Brass Astrolabe Sextante w / decorativa Caja de madera: Nutico SIZE : 6" The box is approximately 7" square and 4.5" tall. The sextant includes a movable radial arm, telescope, mirror, colored light filters and handle. This is a new item made to look like an antique. Some imperfections are likely.Sextants were first used to assist ship navigation in the late 1700s.