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The colour is 06 lilac and it is a version of the 'hook' bag, looks authentic to me!
I have this exact bag!
I purchased it in Italy last year at the Balenciaga outlet. The SAs did indeed call it the "flat hook" and it's a great bag for work and weekends as it holds a lot, plus it lays flat against your body kind of like a messenger. I've gotten more compliments on this bag than any of my others. The only problem is that I have seen some fading, but the one you posted looks to be in great shape and hasn't faded at all.
I uploaded the only pic I have of me wearing my hook...it's not great but I think it could help. I also included a pic of it with some surrounding bbags.