Which famous auction house's 2019 controversial sale of Nazi memorabilia led to new industry-wide authentication standards for military collectibles?

Throughout history, military artifacts have become valuable collectors' items with some commanding extraordinary prices in the retail market. The commercialization of military history has created a unique intersection between historical preservation and retail operations. This trivia question focuses on a landmark auction that transformed how military memorabilia is marketed and sold worldwide, setting new standards for authentication and provenance in this specialized retail sector.

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Hermann Historica of Munich
Sotheby's London
Christie's New York
Alexander Historical Auctions