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 : SEI SZSB006 TicTAC 35th Anniversary Watch, The New Citizen Kuroshio 4 NK0001-25X Green Strapcode Watch Bands
Item number: 20B16PBU63A1A79 Brand Name: MiLTAT Lug width: 20mm Buckle size: 16mm 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 lug width Material: Genuine Alligator Color/Finish: Black Stitches color: Black Lining material: leather