No idea (yet) but it looks good on her! Could be just a prop, I suppose.
OMG - spent hours trawing through the casio site myself & that was the closest I could find too! It does look really close but her one seems to have a distinct join between the watch face & the strap. I did wonder if the top of the grey side bars may just be obscured by part of the watch at that angle. Looks like that could happen with the Casio in your picture.
Yeh, WHY is it that girls look sexy with over chunky outdoor watches?No idea (yet) but it looks good on her!