I’ve looked at both ETA and the later MT-based examples of the Black Bay,
link and the GMT is the only model I’ve found with this ergonomic update. I specifically recall the case edge being fairly sharp on the ETA Black Bay I reviewed several years ago, so I think this is an excellent tweak to the case shape and it undoubtedly makes the Black Bay GMT easier to wear. As a side note, the new Black Bay Fifty-Eight does not have this bevel either, so it really
link does seem to be a GMT exclusive
link (for now).