Very vintage, from 1961, an amazing tool from the US Navy Hydrographic Office in excellent used condition. No. 2102-D star finder with 10 plastic disks, main disk for setting to northern or southern skies, full instructions... All original and in snapping case. Includes a couple of extra items for determining scale of US coast survey charts and local hour angle (LHA) for celestial navigation. Super-cool and educational! No batteries needed!