I bought a late M6 which someone had blacked out the Leica logo and all the white engravings too. I had a really good laugh thinking back to comic books...like the way we were supposed to believe that nobody recognized Robin was really Dick Grayson when he donned that little black eye mask. I venture to guess that everyone knows it's a camera whether or not it's got markings. Anyway, it knocked about $300 off the cost of what would otherwise have been a mint M6, and I had fun re-filling the engravings with white paint and cleaning the black off the red dot, now it looks like new.