Eastern Front. Kriegsmarine Gunner at sea pointing weapon into the sky for protection against air attack. The gun is a 20mm Oerlikon - a.k.a. 2.0cm Flak 29, produced by Semag and Becker in Zürich (Swiss), later than by Oerlikon in Zürich (Swiss). Germany bought many of them before the war, and gave them the name 2 cm Flak 28 and 29 (The Flak 28 used a 15-round clip magazine and the Flak 29 used a large drum magazine with 60-rounds). First they were mainly used in the german navy, but later - and expecially during the war, when many of them got captured - they were also used in other units. The 2cm Oerlikon Flak 28 and Flak 29 apt in the Sockellafette 40 pedestal mount were intended by the Kriegsmarine for installation on ships.The 2cm Oerlikon Flak 28 was the first light automatic Anti-Aircarft weapon to reach the units in 1928 and it was installed on a mobile wheeled carriage.