Wrong size strap. Check your watch lug size and make sure strap you are wanting to purchase is exactly the same lug width as your watch. Note: Not all straps are even sizes. Around 40% of all watches have odd size lugs for example 17mm, 19mm, 21mm, 23mm. You should not assume that your watch lug is, for example, 20mm when it could be 21mm or 19mm. A;lways search online for your watch model or measure your watch ‘lug width’ with a precision measuring device /Vernier Calipers.
