.Appearance It shows signs of use
I'm surprised there aren't any Barnackles growing...
(forgive me, I beg you...)
I am surprised it is not advertised as excellent. Because excellent as opposed to excellent ++++++++ means fair in our part of world. If I decide to buy from Japan I start with Mint rating, or even Like New - then one can expect a good condition. And I am not blaming them, it is probably a cultural thing and we must learn so that we are not lost in translation.
I dunno, it seems that many of the Japanese sellers have ridiculous descriptions. I've seen Mint- ones with fungus in them.
Zinc corrosion possibly.
This is why m6's don't interest me.
Interesting. I have a chrome M6 body, purchased new in 1984, early serial number (I think) 170XXXX; red Leitz circle on front. Have used it quite a bit. No deterioration of the finish on any of the surfaces.