A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2020 Apr 26, 13:54 -0700
There's also this one for sale (listed today, so probably the auction that Dave Walden referenced):
Anyone need more photos? There's this neat thing called "Google" that may help: Google Image search for Hyatt Celestial Coordinator.
The device is a simple analog "computer" from the 1940s for solving spherical trig problems with a resolution (accuracy) of about half a degree. Here's an article on the device and related tools from marinersmuseum.org: Magnetic Compass Meets Sundial (pdf).