The Benz Knives were created by Benni Doron, a serial murdering saber blacksmith, and sold in his shop. They are unique blades and highly valued (and thereby very high priced) by collectors world wide. There are only 288 in existence today numbered on the blade, one for each murder Benni Doron committed. He was eventually caught and put in prison for his crimes, but while he 'rotted' in his cell he became ever more popular, especially with the release of his book which accounted for each blade and its conception to its creation.
These Benz Knives are extremely rare, as such very few people have them, even fewer will admit to having them in fear of them being taken away.