I don't think it's either leather band. I think it's the link bracelet, 38mm. Remember, the link bracelet is not polished like the case, it's brushed, and so in a relatively low key photo like this, it's going to appear darker than the casing. Throw in the extra contrast and general low quality of images being evaluated and it's easy to see how it might look black when it's really just brushed metal in the shadows.
So yeah, I'm thinking 38mm SS with link bracelet.