The Athens City Series pen is a chameleon in that depending on how the pen lies you get see more or less blue and yellow banding on the cap and barrel. This is one of only three of the twelve M620 pens that feature silver rather than gold trim. All in all a beautiful pen.
This rhodium plated 14K gold extra fine nib came with M605 Blue Marine and its wholly silver-like colouring complements the silver trim on the pen. A nice wet extra fine nib, smooth and well behaved.
Tenebris Purpuratum - its latin. I had to resort to Google for more of a clue. Tenebris is a style of painting where one figure is highlighted in a scene and the rest is in darkness. References to Purpuratum appear to be for a species of orchid or a beetle. Well I am no more enlightened - pun intended.
A nice dark purple bordering on aubergine. Flows well, is dark enough for formal use, and shades slightly from this fine wet nib.