INERT DEACTIVATED. Rare Experimental, Vickers .5 690 (12.7 x 120SR) High Velocity Ball Round For The Experimental Class D Gun. - O 1806 INERT DEACTIVATED. Rare Experimental, Vickers .5 690 (12.7 x 120SR) High Velocity Ball Round For The Experimental Class D Gun. - O 1806 Other Ammunition

INERT DEACTIVATED. Vickers experimented at the end of the First World War with .5 inch machine guns based on the .303 Vickers machine gun. Further development resulted in the in the high velocity Vickers gun designated the .5 664 and the .5 690. The only difference was in the weight of the bullet in grains, the weight being 664 or 690 grains. The gun developed a muzzle velocity of over 3000 feet per second but orders only came in from the Japanese navy. The gun was called the Class D and this round has a brass cartridge case with a semi rimmed base which is headstamped K.35 (Kynoch 1935) .5V 690 (the gun and bullet weight). The copper jacketed bullet retains most of its original purple bullet tip designating a ball round. The unfired brass percussion primer has a purple primer annulus signifying a ball round. The price for this rare experimental round includes UK delivery and no licence is required to possess inert rounds in the UK if retained as part of a collection or display. (20mm & below). O 1806