i live in Hong Kong...its true that Ruby here is for Japan market. My source told me that Japan has its own sourcing/ design team and their stocks are always different than anyhwere else in the world. oh by the way, Ruby line will soon be stopped. RRL has decided to stop selling them soon.
That makes sense, regarding the Japan design.
Rugby has been dead since February this year.
An interesting find that I came across while Googling - this is the Final Marketing Plan for Rugby that was published late 2011/early 2012 (my best guess): http://ezielsresume.files.wordpress.com/2012/01/final-marketing-plan-for-rugby.pdf
It gives some very cool insight into the minds of the RL team at the time.