A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Christian Scheele
Date: 2014 Nov 27, 06:40 -0800
the bottom image in the link shows a sidereal time deckwatch. (As a courtesy to the owner(s) of this image I have not made a copy of it).
The bezel has 3 scales. An interesting feature?