Which military artifact category has seen the most significant price increase in auction markets over the past decade?

The collection and trade of military artifacts has evolved significantly over the decades. From battlefield souvenirs brought home by veterans to sophisticated auction houses specializing in historical military items, this market has seen interesting shifts in consumer preferences, authentication challenges, and ethical considerations. Test your knowledge about this specialized retail sector where history and commerce intersect.

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World War II German helmets and uniforms
Medal of Honor recipients' personal effects and documentation
Civil War rifles and sidearms
Cold War era Soviet military equipment