Postcard with the image of the Austro-Hungarian anti-aircraft gun M5/8

The original postcard is in excellent collectible condition. I didn't get through the mail. Quite rare. Guarantee of authenticity.

During the First World War, 8-cm field guns were also used as anti-aircraft guns. To do this, the guns were placed on various kinds of improvised installations, which provided a large elevation angle and circular firing. The first use of the M 1905 cannon for shooting at aerial targets was noted in November 1915, when it was used to protect against enemy fighters from an observation balloon near Belgrade. Later, on the basis of the M 5/8 cannon, a full-fledged anti-aircraft gun was created, which was a field gun barrel superimposed on a pedestal installation developed by the Skoda plant. The gun was designated "8 cm Luftfahrzeugabwehr-Kanone M5/8 M.P." (the abbreviation "M.P." meant "Mittelpivotlafette" – "carriage with a central pin"). In combat position, such an anti-aircraft gun weighed 2,470 kg and had a circular horizontal firing, and the angle of vertical aiming ranged from -10° to +80 °. The effective range of fire at aerial targets reached 3,600 m.