Henley Extended Extra-Long black watch straps are 190mm long for widths up to 14mm and for straps that are 16mm and wider, the length of Extra-Long straps is 210mm.
Extra-Extra-Long watch straps with a length of 235mm are also available to purchase.
190mm long for widths up to 14mm’s (75mm short part, 115mm long part)
For straps that are 16mm or wider, the length is 210mm (85mm short part, 125mm long part)
8mm wide strap – 8mm wide buckle
10mm to 28mm width straps – buckle is always 2mm less
e.g. 14mm watch strap has a 12mm buckle, 28mm wide strap has a 26mm buckle etc.