Can't comment on any of his other straps but I ordered this one a few months ago. One-piece Olive leather nato. Custom length:
https://www.finwatchstraps.com/colle...er-watch-strap
Took around 3-4 weeks to arrive. More swamp-brown than olive tan as it looks in the pics.
I was a little underwhelmed if I'm honest. I suppose to be fair the description is pretty accurate, but it feels rather flimsy on the wrist because of how thin it is, and the finishing is crude. Not that there's anything wrong with that per se and it'd be a great match for a smaller vintage military watch, but overall it didn't feel like it was quite worth the cost imo.
Cheers - that's a useful (fair) warning I think.