The 30 x 210 cartridge was developed during WWII for the German MK303, an AA gun intended to be fitted to the new Type XXI U-boat, however this development had not left the experimental stage before the end of the war. The MK303 was developed by the Czech Arms Factory in Brno as a gas operated weapon and belt fed. This cartridge is now in use in the AAA gun M53 and in the self propelled version M53/59. It is also fitted to an armoured version of the Praga V-3S 3ton truck, the twin barrel AAA gun mounted on top. Ammunition is fed in 10 round charger clips, the self-propelled gun has big 50 round boxes This near mint round has a zinc finished steel case with the headstamp 27 aym over OTK (crossed swords 59) 46 over 59 . The steel projectile is is painted yellow with a red band over the driving band and green below the fuse. The projectile is stencilled in black 515/81 and has a steel driving band. The round is fitted with an alloy CZ 301A self-destruction fuse stamped CZ301A- 6/81 .Price includes UK delivery. Sn 11061:9