A black painted brass three circle vernier sextant (175mm radius), swivel magnifiers, the main brass arc signed and numbered 'H. Hughes & Son Ltd 59 Fenchurch St. London 7973' inset silver scale divided 5 -0 -155 , index and horizon mirrors each inscribed 'Stella', the horizon mirror adjustable in azimuth and with coloured shades, sun inverting and star telescopes, in fitted mahogany carrying box with National Physical Laboratory Certificate dated December 1922 -- 255mm wide