AK-47: The most recognizable weapon in the gun world is also one of the most powerful, and durable. While probably don’t need one now it might be helpful once every structure of law enforcement and civilization collapses into dust.
Serbia: Conquered by Roman Empire, Byzantine Empire, Bulgaria, Ottoman Empire, Austrian-Hungarian Empire, Yugoslavia, Germany, USSR
Discovered on the far east shores of Russia, no one has any idea what the hell this is.
Discovered on a Brooklyn beach, no one has come forward with any useful information towards identifying this creature.