I'm definitely pretty new to the Bentley so excuse my dumb question here.
What is the dead giveaway on the operation of the Chrono?
The subdial arrangement looks pretty on from the pics I can see on the Breitling for Bentley site...font looks decent, hand length fine, etc.
The biggest tells from what I understand are what was mentioned above, that the crystal shouldn't rotate when you move the slide rule bezel, and from what I can tell the date font is thinner and bigger on the rep than the gen.
I love that caseback though.