On finish - mine has a bright polished finish externally, but I have seen brushed finish ones too. IIRC all the brushed finish ones had adjustable target sights - mine has fixed sights.
On the dark bore - have not used BP substitute for many years. It has only turned dark recently and the only change I can think of is that have started using Wurth saBesto ULTRA 2040 after cleaning rather than WD40, but I spray the 2040 all over it and it's only the bore which is dark. Maybe just an age thing?
On London Grey - I have seen it on a friends Euroarms R+S and it really does not look like SS (quite attractive all the same).
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