This is a photo by the famous Helmi Flick of a beautiful Savannah cat. I don’t know from Helmi’s description on her photo gallery what generation from the wild this cat is. Looking at her (I think she is female), I lean towards writing that she is a high filial, say F1 – F4, something like that. This is because of her size and stature. There is no scaling but I do know the size of the table on which she is sitting (and behaving herself nicely). I am sure that this is a very large domestic cat.
Another give away for me that she is a high filial Savannah cat is her coat. It is like a serval’s coat: well defined, dark inky spots on a straw colored base. The long elegant limbs are also reminiscent of the serval which has the longest limbs to body ratio of all the world’s cats.