NATO Regimental Strap Black and Gray "James Bond"
Anyway... A few years ago, GQ magazine ran an article on Bond's gizmos and gadgets, including his watches. GQ approached the MoD strap manufacturer to commission the "Bond" strap for a competition. The strap they commissioned was a simple flat strap, not the NATO style. The colors are actually the genuine regimental colors of the General Service Corps and are also the colors of a London Gentleman's private club.
Important about the 28 mm size. The 28 mm strap is stitched together, not glued together as the strap in the picture.