Marc Cain blazer

Lovely cotton-blend blazer from Marc Cain. Now, I hope I don't get into trouble here, but I'm calling it black. (Please note actual colour is somewhat darker than in some of the photos.) It might POSSIBLY be construed as navy, but if so it's so dark as to be almost indistinguishable from black. Anyway, it's a great blazer in excellent used condition. Side pockets. Cool silver buttons. Can't imagine what 'size N 4' is supposed to mean, but I'm calling it a medium. Measurements in photos.