This is a great model of the 'real' thing. A fine hand machined and highly polished solid brass sextant in a brass inlaid mahogany box with a beveled glass etched top. The etchings on the top explain the use of a sextant in a decorative fashion. A great educational instrument and an excellent gift piece all in one. The sextant has all the working parts and mirrors with what appears to be a precision scale to take fairly accurate global measurements. But this sextant should not be considered a real accurate instrument. Measurements: 7.75" Specifications: -Measuring range: 0 - 120 degrees -Accuracy: +/- 25 seconds -Shades: 3 for index mirror, 3 for horizon Weight: 5 lbs 0 oz. -Cabinet: Solid Mahogany with Brass Trim. -Dimensions: L: 8.38in x W: 8.38in x H: 4.25in -Weight: 3.60lb