Big fan of..
Phenomenato
https://phenomenato.com
Peter Watchacc
https://www.instagram.com/peter.watchacc/?hl=en
I've been eyeing a few navy croc straps to fit a vintage Grand Seiko 4420-8000 for a while from Peter. His quality seems top notch and it looks like his attention to detail on materials is without compromise (seems to share sources with LVMH, etc).