Pin with the famous ship Aurora.
The Aurora was made in 1903 and most of the crew joined the Bolshevics who were preparing a communist revolution led by Lenin in 1917. This ship fired the first shot signalling the start of the October revolution. In WWII the guns was taken off the ship to use it for the defence of Leningrad. After the war the Aurora was a navy training vessel and later, till this day, a museum located at St. Petersburg (formaly known as Leningrad).