Mirrors Sextant mirrors have a limited lifetime before needing resilvering or replacement. Estimates range from 2 to 6 years in marine service. While resilvering is an option, good quality is hard to achieve. New mirrors are not much more expensive, and are shown below.

Horizon Mirrors
Astra IIIB – 51mm diameter with mirror frame
Traditional (half silvered) #0504R
Whole Horizon #0503R

Other sextants (Cassens & Plath, C. Plath, Tamaya, Freiberger) 57mm, frame not included
Traditional (half silvered) #0703

Index Mirrors (56 x 42mm)
Astra IIIB no frame #0517D
Astra IIIB with frame #0516D
Other sextants no frame #0517D

Telescopes
The 3.5 x 40 scope supplied with the Astra IIIB has become a Universal Scope, and has been sold with Cassens & Plath, C. Plath and Tamaya sextants. To determine the fit on other sextants use the diagram shown below. (NSN 6605-012533442)

Universal Telescope #0508

To determine the fit on another sextant, the ends of the fork from its regular scope should approximately match the outlines to the right.forkends

Replacement Parts

Spring Clip

$1.00

Sextant Accessories

Universal Telescope

$120.00

Replacement Parts

Index Mirror with Frame

$95.00

Replacement Parts

Index Mirror with NO Frame

$90.00

Replacement Parts

Mirror Adjustment Wrench

$5.00