What can I say? The San Francisco is still my favourite M600 pen and is in the top five of my favourite pens in my collection. Not the brightest of colours but it has a pearl essence that so attractive.
One of my older (two chick) M600 nibs, from back when Pelikan actually made a fine that was close to being fine.
Definitely a blue black, the fine nib probably does help this ink show its best, Some shading present on Tomoe River 52gsm. A classy ink that is still the only numbered limited edition that I own.