This is a cross-post for the folks in this subforum, the main thread with a lot of macro and high quality pics on the Rolex forum here, please check it out - https://forums.watchuseek.com/f23/new...b-3461737.html
TL;DR - I bought a Hirsch London genuine alligator strap in the gold color for my vintage Rolex Submariner 16800. The strap is expensive but totally rocks. The alligator grain is great, the strap is supple and comfortable, and tapers from 20 to 16 mm. It is also thinner (feels thinner?) than the mentioned 4mm thickness on the Hirsch/WatchObsession website.
Three pics here, many, many more on the link above.