The Bond Nato straps are fun, comfortable and cheap as chips. Most OEM replacement straps are expensive - eg you can get c 6 Nato straps for the price of one Sinn leather replacement. They do fray after a while, but just get some more. They are easy to swop around to suit your mood. Not much more difficult than putting on a clean pair of socks. If you do want a new leather strap, go to your local watch shop and maybe buy a Hirsch, the gold standard for medium level leather straps. You will pay a bit more than you might over the internet, but they will fit it for you (so you do not scratch your lugs) and you will help them stay open.