In general, most watches are apples to apples.
If Josh, Silix, Angus, Andrew, Ruby, etc.. all have a watch and the movements are the same you can assume they are the same and made at the same factory.
Therefore your double AR hunt from different dealers would be an exercise in futility.
I have this watch, not from Silix, but again same thing it is the ETA version, I would not disagree that it is double AR coated, but it is a somewhat weak double AR factory coating that may be the equal of a high quality single AR coating.
An aftermarket double AR coating is much better, but no dealers offer any watch with AR like that.
I would say the AR is close to my Swiss SFSO, maybe slightly worse, but very close.
Not as good as factory AR double on IWC CD or HBB Ultimate versions,but still close.
Compared to our aftermarket double AR options, all factory options are inferior.
Conclusion: not all double AR coatings are created equal.
If Silix says it has Double AR believe it, but if a respected member reviews it and says it looks like a single AR, believe it.
In my opinion the AR is good, not great. Good enough that I don'tever envision myself upgrading the AR coating, but crazier things have happened.
Cheers,
M