I was given a Leica I converted to a II or III; it has the original collapsable 5cm nickel Elmar, part of a well used kit from the original owner (who is long gone). Along with it is a 3.5cm Summaron -- on the Summaron (only), the word "Leitz" is etched out like someone took a dremel to it, on the face of the lens. Of course there must be a good reason for this, and I have read of other old LTM gear that is defaced this way. But I would love to understand more about why. I asked about this on another forum and someone suggested that at the end of WWII USA military personel who had purchased Leica gear in Germany were required to etch out the name before bringing it back. This sounds pretty logical, in a US Army kind of way. Can anyone share more history, or stories, about this? Other rationale? Thank you!