In A Nutshell Antiques and Interiors has dated this piece to the Victorian era.

The scale is engraved with the name ; "Newton. London. 7524" and inside the box is an original maker / retailer's label for "J.Sewill, Chronometer Maker to the Admiralty. Manufacturing Nautical Optician. 61 South Castle Street. Liverpool".
It has two brass closing latches, a recessed military style carrying handle and it comes with its original key. Given the handle and the Sewill label I wouldn't be surprised if this were a Naval piece.

The sextant is in good condition for its age. It has been lightly cleaned and displays very well. The lenses and mirrors are undamaged and produce a clear image with the original sighting lines. All parts move as they should. There is some tarnishing and wear on the finish in places but overall it displays well. The box is not without some small knocks, splits and some minor signs of age but overall it has a nice aged patina. I have not tested the accuracy of the sextant and it is being sold as a collectors item rather than a working scientific instrument.
The best description comes from the photos so please look at them all carefully and if you have any questions just ask.
Tracked UK Delivery £15
In A Nutshell Antiques and Interiors has dated this piece to the Victorian era.
Selling good quality victorian, georgian and earlier furniture, accessories & decorative items. Ashburton, devon. LAPADA member
You can view the stock and full dealer information on the In A Nutshell Antiques and Interiors Profile Page
In A Nutshell Antiques and Interiors is a registered member of LAPADA CINOA