The design is quite different from the later box sextants one sees for sale, and is in working order with the mirrors in good clean condition, and it has an internal sliding sun filter unusually operated by a crescent shaped slide on the face plate as well as one on the sliding shutter. I can see that 2 of the 3 side screws securing the face plate to the main body are missing but this doesn't affect the operation of the sextant, and probably easy to replace.
Nevertheless, this is one of the first box sextants made and very rare, so it will be one for a collector. It measures 70mm in diameter and weighs 280grams. Please study the photos as they are part of the description, and I will be happy to answer any questions if I can. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".
The seller is "nicke11" and is located in this country: GB. This item can be shipped worldwide.