The black MOP in your Calendrier is just sublime... Subtle when you need it to be, yet can really be fired up when you want... I also love the added detail of polished metal window frames for the month and day that are only available for these MOP dials. Interestingly, the hole in the dial for my MOP Optimum's remontoir air brake does not have this detail - I was expecting one, but when I got the piece was a bit surprised it didn't have one. On the Calendrier, I love how the shiny rectangles balance out the polished rehaut ring of the subdial to the right!