Suede vintage leather watch strap (Crazy Cow, Cognac), handmade in Finland -14 mm, 15 mm, 16mm, 17 mm, 18mm, 19 mm, 20mm, 21mm, 22mm, 23 mm, 24mm, 25 mm, 26 mm.
Notched Ends/Corners 18mm : Genuine Leather Watch Straps, silicone, nylon | Buckles & Clasp & more - SecTime UK
A 20mm strap for 18mm lugs? | WatchUSeek Watch Forums
Shell Cordovan Corner Notched Centre Notched Watch Strap - Etsy
Classic watch straps - With notch Visconti Milano watch straps handcrafted in Italy