There are three Astro Compass Mark II, in green wooden boxes with canvas handles. It can be pointed at a known star, including the sun, and used to indicate true north. Manual included.
Sperti Inc., Cincinnati, Ohio
Astronomy Department, University of Illinois, Urbana, Illinois
Copyright Michael Svec
University of Illinois Observatory Collection A231.1, 231.2, 231.3
University of Illinois Observatory, Urbana, Illinois
Sperti Inc., Cincinnati, Ohio, “Compass,” University of Illinois Observatory Collection, accessed December 16, 2018, https://uiobservatory.omeka.net/items/show/31.