Early Harley Flathead with the front case going off to the side for the generator and the distributor up top. But in this case it's running a magneto so no battery is required to fire it up. Could be 61" or maybe even a 80", but probably NOT the 45".
I blew it up and it's definitely a Harley Flathead, but the crank centerline seems to be about a foot too high to line up with the main flywheel in the drive system. But it could have a gear reduction box to get the crank to the main flywheel input.
Very interesting to all the detail they've put into this if it is a Photoshop.
Still very cool none the less!
