How wide is the Classic Buckle in mm. Most watch straps are measured in mm, 18, 20, 22, 24 etc. At the ends of the bands closest to the watch how wide is it? Is there room on the piece that attaches it to the watch. What is the interior width of that U shape? If it is a 20mm strap. Could the piece accommodate a 22mm or 24mm? Thx.