There is no such thing as 1:1 rep of ANY watch. Period. The terms "1:1", "Grade AAA++", etc. are all dealer hype intended to lure in the unwashed masses.
That being said, the Roadster reps are pretty good. Probably 95% or more accurate. No one will ever call them out as a "fake" unless you waltz into an AD, take it off, hand it to the most experienced clerk they have and ask them to compare it to one in their case.
By the way... take it from the voice of experience... the Roadster reps are NOT WATER TIGHT!! Take them off even to wash your hands.
Any of our trusted dealers can get one for you.
Good luck.