U.S WW2 Rud star identifier a-n type 1

U.S WW2 Rud star identifier a-n type 1

This star finder, designed for aeronautical use, was based on the Rude form as modified by Elmer Collins of the United States Hydrographic Office.
It consists of a white plastic planisphere with the northern sky on one side and the southern on the other that shows all the stars in the American and the British Air Almanacs; nine clear plastic altitude-azimuth templates for use at different latitudes up to 85° north and south; an instruction card; and a leatherette container.

It was published in March 1942 under the authority of the Secretary of the Navy, and cost $2.50 to produce.