https://www.ebay.com/sch/i.html?_nkw=Davis+Deluxe+Mark+25+Master+Sextant&_sacat=0&_dmd=2

Davis Deluxe Mark 25 Master Sextant

Regular price
$208.00
Sale price
$141.00

Mark 25 Sextant #025 The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger mirror, sometimes referred to as a "full horizon mirror". A special coating is applied to high quality optical glass to allow the user to see through this mirror, yet still pick up images as faint as low-light stars. The Mark 25 is illuminated by a long-life LED and made of an upgraded plastic that is very stable. Comes with instruction booklet.