The B04 and B01 have the same base, which in turn is the same diameter as the 7750, so as to minimise the re-engineering of existing case designs to accept a Bxx movement.

BTW. That GMT dial/bezel styling is a typographical dogs breakfast! It's a highly polished, overpriced turd of a watch. What are Breitling thinking - signing off ridiculous "pick and mix" design?

I've only read your Chronomat B04 GMT review at the moment, Ricardo, but it's up to your usual very high standard. Excellent writing and a nice review.

That said, I don't echo your appreciation of the GMT quite so much I'm afraid. In the initial pictures I thought I was going to love it, but after handling one I found that I really didn't like it at all. For a start it is way too shiny and way too big IMO, even for my 7.5 - 7.75" wrists. There are two size issues for me - firstly, the long lugs on the new Chronomat cases mean it's a very long case - far more so in fact that the fractionally larger bentley models that fit me just fine. And secondly, it's a seriously high watch on the wrist - almost SA-like, which for a (fairly) cheap and cheerful bling-bling "gangsta boy" watch like the SA is fine : considerably less so for a serious attempt at horological mastery. And I'm 100% convinced it's big for big's sake because, as Ike rightly pointed out, the B04 is the same size as the B01. I'm not sure I buy the increased legibility argument either as the standard Navi, at only 41mm or so, also has a heck of a lot going on on the dial without the need to "bling-out".

IMO, the Chronomat B01, for all it's multiple font and bezel foibles, is the MUCH nicer watch.

I just hope Breitling have the good sense to put the B04 in a 44mm to 46mm traditional Navi case at some point.