I have been looking for straps for my reverso for a while, since I can't get a good fit with the OEM strap and deployant clasp. After trying options from delugs, I found the quality of their spring bars to be a little lacking, which obviously isn't a good...
one might also note that fluco are the oem for a certain other Glashütte manufacturer who proffers suede straps with their Bauhaus offerings ;-) Notably cheaper if unbranded, perfectly comfortable, and available in about five colourways (sand, black, blue...