It seems quite appropriate that a pen that represents a square in Paris comes back into use on Bastille Day. The M620 Place de la Concorde has quite subtle banding of light blue, grey and off-white with rhodium trim.
One of my newer M600 14K nibs that is a good writer but is not as fine as some of my older fine nibs.
Diamine Asa Blue is a favourite of mine. It shades delightfully and sheens red on Tomoe River paper. It has been in my collection a longtime and it is sad that I only see it every two and half years these days.