Hmm, thought all 900 were dimpled and as Lukas and Tom said, this carbon patch looks like something went straight trough there, but it doesn't look too bad ,and theres no mark of original decal. Zipp 950 had decals under the vinyl (not sticker), so maybe this is indeed 900. Confused now.
Thanks - I've been looking around on Google and it looks similar to this 900
What makes you think it's been repaired?
I'll be taking a look at it in person soon so will be able to check out any possible damage...