It isn't listed in Tank007's store, they only have 2400mAh there and different packaging.
It's a genuine Tank007 product, if that's what you're asking.
It doesn't look like this: http://www.tank007store.com/products/TANK007-18650-Li%252dion--battery.html ...
But maybe tank007store.com doesn't show all tank007's products/packaging.
Apparently they don't. I took the picture above myself and it's 100% genuine from Tank007. And as you said, the other one is a 2400 mAh model while this is 2600 mAh.
Is it a good battery?
I have no equipment to test capacity but I will try to do some other tests this weekend.
It's a really good battery
I have tested many of them. Actual capacity under 1A load is about stated - 2550-2600 mAH (first cycle!). And fresh battery voltage -3.87 V under 1A load - so voltage sag is not much, internal resistance is low. Actually, it's a best batteries I have seen at this price point
Photos or graphs please, too much company SPAM these days.
Sure, as you request :) I'll update my post as soon as I will get it - Imax B8+ will help me with it