A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2016 Aug 6, 03:14 -0700
Im not a sextant expert at all but I'll take some guesses.
My first guess is it's a Simex. A second guess is Scientific Instruments.
And then there is a run of Japanese copies such as Saura Keiki, Ogawa Seiki, Tamasokki and Toizake.
But I'll stick with Simex.
Attached are photos of each guess.