Rally racing watch strap was perforated to help with ventilation and breathable for the user. Average thickness around 3.5mm, tapered width narrows down to make it more symbolic. For people with chronograph watches, rally racing straps should definitely be on your top list of choice when looking for new watch straps.
Watch Bands Lookbook demo watches by Strapcode : Hamilton Khaki Field Automatic 38mm Men Watch H70455733
Item number: 20P16PBU63S6Q11 Brand Name: MiLTAT Lug width: 20mm or 22mm Buckle size: 16mm or 18mm Buckle Include: Yes Buckle type/Finish: Polished 316L Stainless Steel Pin Buckle Overall Length: 120mm + 80mm Thickness: Approx. 3.5mm - 2.7mm Spring bar hole dia.: 1.78mm Design to fit: All watches with 20mm or 22mm lug width Material: Nubuck Leather Color/Finish: Sandy Brown Stitches color: Beige Lining material: leather