I just received a new watch strap and deployant buckle for my Speedmaster Pro from a recently new online friend (omega2915) - it's a Bandenba leather with deploytant (says SUISSE QUALITE under the name).
The leather is very nice and comfortable, and the deployant has two buttons and a second latch for security, although it's not on the level of refinement of the Omega clasp which doesn't have the second latch. Very happy with it. Hope he likes the black Italian leather Hadley Roma NATO coming his way soon...
I don't normally wear it this far up my wrist, I just put on for a quick photo after installing it.