House at Cannon Cross, Sokolovská street, Karlín, Prague

The Cannon Cross was an Austrian medal that was awarded to all the soldiers who fought against Napoleon. The medals were made from metal of captured French cannons. Therefore, the cannon cross. There are two houses in Prague with this sign.
Since 1770 the houses in Bohemia have been given its numbers. But before that there were house signs. And even then these signs were used, but only as an ornament.