I was bidding on a "never used", "perfect TRIM without signs" M300 and couldn't help but notice this in the photos: Then my gently used M200 arrived today and it had the same thing on the clip. What I had assumed was tarnish was actually a brown substance of some sort that wiped off easily enough (I did have to fold the paper towel over a thin screwdriver blade to get at the edge up against the plastic end cap) and the gold plating seems fine. Just curious if anyone else has seem this or knows what it might be.