Every now and then you see them surface, those expensive and rare Leicas. The Leica Luxus, for instance. Only three of those gold plated Leicas were ever made, and only one of those is known to be in existence today. Or the Wehrmacht, Luftwaffen or Kriegsmarine engraved Leicas of the second World War. But most of the time these ‘rare’ cameras are fakes. How can you tell the true Leicas from the fake ones? A small guide.