IIRC in the TV show there's a scene where the Americana shopkeeper (Mr. Childan) shows someone two identical cigarette lighters, one of which was in the pocket of FDR when FDR was assassinated (Man in the High Castle takes place in an alternate timeline). In the novel, this is actually done by the owner of the fake-gun-factory, and it gets a longer treatment.

This is the only version I've known— I haven't read the book.

I highly recommend this story to anyone who's even slightly curious.