The speedy is indeed a very good watch that goes with everything. But for me it just condenses into just 3 straps. 1. The OEM bracelet which we all see and know. 2. The brown leather strap. Kinda fancy but I feel doesn't quite match the character of the older vintage speedmaster. 3. And finally the NASA strap. Thanks to the posting of sky21, I got the Kizzy strap. Doesn't look like much at first, but I have to say this is THE best looking strap for the speedy. Very purposeful and matches the looks and feel of the watch. It just says that I am here for a purpose and I do my job.
That nylon strap looks excellent on your watch. Brown leather can be tricky. I looked for a long time before zeroing-in on what I think is a good leather colour for a non-vintage, hesalite Speedmaster. I'd call it dark brown calfskin.
Massimiliano at GLC straps, I'm really pleased with the straps and service I got from him. If you can't see what you want, just ask he's really helpful. Ps I'm not affiliated or anything just a happy customer