Hublot Classic Fusion Titanium Black Shiny 42 mm parent reference 542.NX, grouping exact dot-configuration references 542.NX.1170, 542.NX.1171, 542.NX.1270, 542.NX.2611, 542.NX.7071, 542.NX.7170, 542.NX.8970, 542.NX.9010.