From my experience (with some exceptions) if a rep is less then $300 it's not grate, easily spotted, I walked in with a modified $500 3KF with green Dial to a Patek authorized dealer and everyone complemented me, was able to get in a waiting list for a blue Dial 5726, now of course if I took it off or one of their watch technicians looked at it closely they would prob know immediately, but that's the power of a good replica, with the right car and clothes it can be a great power, can be used to make connections and open doors for you, invest a few hundreds on a good rep you won't regret it