Which innovative product design approach by the Imperial War Museum (UK) led to its most successful subscription model in 2015?

Military history museums face unique challenges in product design and retail strategy. Beyond preserving artifacts, they must create meaningful merchandise that respects historical significance while generating revenue. This poll explores how one famous military museum tackled a product design challenge that revolutionized military museum retail operations worldwide and created a new subscription model for history enthusiasts.

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The 'Fragments of War' series, sending subscribers authentic metal fragments from restored vehicles with historical documentation
The 'Commander's Library' program, providing replicas of tactical manuals and field guides used by famous generals
The 'Voices from the Front' audio subscription, delivering remastered veteran interviews on vinyl records
The 'Battlefield Cartographer' collection, featuring limited reproduction maps from pivotal battles with historian annotations