Which military artifact category has seen the most significant price increase in the global collector market over the past decade?

The collection and trade of military historical artifacts has evolved significantly over the decades. From battlefield relics to museum-quality pieces, military memorabilia represents a specialized retail market with unique challenges and ethical considerations. This trivia question focuses on recent market trends in this specialized sector of historical collectibles.

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World War II Luftwaffe flight jackets and insignia
Civil War-era firearms and swords
Cold War Soviet military medals and decorations
Ancient Roman military equipment and weapons