Not co-axial movement. (Zin gave details about this earlier)
Is full-size. The key is the little piece of the three o'clock marker next to the date window. On the mid size, there is no room for this little piece of marker, and the window itself makes do as the marker.
Authenticity of this piece from photos is impossible. The pictures appear to be of a genuine watch, but many fakes look good from a few feet away... And there is no guarantee that the pictures are of the watch you will receive from the seller!!!
Price is OK, but high without documentation and the boxes. If all was included, it would be fair, but not spectacular.
Keep looking. For a pre-owned Bond, they are quite plentiful... Many trade-ins on the new Planet Ocean as well, so they will be available for many years to come too.
Great watch by the way (when confirmed genuine)...