English marine micrometer sextant marked “Heath Navigational, London S.E.9”, “MC1”, “78016” and “Made in England”, presented in a fitted wooden carrying case. The instrument carries the “Hezzanith – Endless Rapid Reader – Automatic Clamp” plaque. Features include a black textured metal frame, graduated arc, micrometer drum, telescope, adjustable mirrors and pivoting sun filters. Inside the lid is a W. F. Stanley & Co. Limited Certificate of Examination, dated 17 March 1978, bearing the matching serial number 78016. The certificate records corrections at various angles and specifies a 4× telescope. An additional nautical-instrument service label is attached. Supplied with the brush, adjustment tool and other accessories shown in the photographs. Details -Maker’s marking: Heath Navigational, London S.E.9 -Instrument: Hezzanith marine micrometer sextant -Model marking: MC1 -Serial number: 78016 -Country of manufacture: England -Period: second half of the 20th century -Examination certificate: 17 March 1978 -Case: fitted wooden carrying case