I am based in Europe.
Any ideas where to look for one?
Panatime has some nice Rios Alligator ones, I got one of them as well for my IWC Ingy laureus. They are a bit stiff at first but very nice and comfy after some wearing.
I would also advise to take a look at the straps made by Peterwatchacc, they are great as well and of the best.
check it here:
Also check out jacobstraps (spain) and ABP Paris (france). Imo jacobstraps is top notch, especially exotic leathers. Fair pricing as well. He is my go to guy for AP ROO straps, honestly even better than OEM...