Superb Antique Marine Sextant by Coombes, Devonport, Plymouth.

Cased in its original mahogany box to appears to have all it's original accessories It even still retrains the tommy bar for adjusting/ changing the mirrors. The icing on the cake is that we know it's original owner, twice decorated WW1 naval hero Captain Leighton Leith DSO,CMG, 1876-1940.

eBay