A 3½ inch radius (8cm.) WW2 micrometer sextent as issued to R.A.F. Coastal Command, the index arm inscribed A.M. Ref. No. 68/177, the main arc with inset silver scale divided 5 - 0 - 120 and numbered 37114, four index and three horizon mirror shades, HUSUN Certificate dated 30.10.43 in bakalite carrying case -- 8in. (20cm.)