Mk III prismatic marching compass Instructions for Use. MK III prismatic marching compass 1942 . MK III prismatic marching compass 1943. MK III prismatic marching compass 1944. Military wrist compass by Barker 1950's. G150 prismatic marching compass no1 . G150 prismatic marching compass no2. Military pattern Mk 02B compas and Azimuth no 4 Sold ...