In an upmarket suburb of Buenos Aires, 6,000 miles from the racially supremacist Nazi ideology from which it derived, lay a device used to measure head size. Contained in a velvet-lined box, it will soon go on public display in Argentina as part of an exhibition of dozens of Nazi relics seized by police from an art collector’s home.

The case has ignited speculation over who has cashed in by selling such items to obviously eager buyers. All were claimed by the collector to be mere reproductions, but have since been confirmed as original Nazi-era memorabilia, valued at £20 million. Suspicion has fallen on the families of the thousands of high-ranking Nazis who fled Hitler’s defeated Third Reich to South America at the end of the Second World War and escaped justice.

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