The M620 Athens is such a pretty pen. The combination of the blue and light green longitudinal stripes make for an interesting contrast.
My M620 18K nibs are in the main excellent writers and this fine is no exception.
Sailor Epinard is a khaki green that while shading little, and lacking any sheen still holds my interest. It might be the smell - Sailor inks have a very distinctive chemical smell which strangely I have anyways liked.