Hi Adrian,
As bkg said this is a tough one because the reps of these are so good. I have the chrono version of this and for me there are a few things i would mention in addition to bkg's comments. First off you should take it to a Breitling AD or watchsmith and get them to take the back off, or if you can do it yourself, take some pictures and post them on here - there are a number of ways to get the back off, roll up some strong adhesive tape into a ball and twist anti-clockwise whilst applying some pressure, you can also use rubber gloves to get you some purchase on the caseback and do the same. There are plenty of guys here who will tell you straight away if the movement is gen or rep.
The areas that concern me are the numbers on the bezel and particularly the 5s, the dots between 60 and 15 look too big to me, but the fact that you have dots instead of small dashes means this is a newer version and I'm not sure any reps were made with the newer style dots. The crown guard also looks wrong compared to the gen and too short but that could be the angle of the photos. Take a look at the second hand the white paint stops short of the round part of the hand and should go all the way until it meets this. Check out the Breitling site and images of this watch on google, you haven't shown the non crown side view, their should be an escape valve there.
Hope we're blowing smoke out of our asses here and being over cautious and all is good for you, but get it sorted asap for all sorts of reasons and please let us know how you get on.
