Here's a link to a similar pickup bed on our 1915 roadster.
Look at the bottom of the doors and the dog leg in the windshield brace which indicates the windshield folds back.
: ^ )
Great photo! It must be an early '14. Look at the shape of the sides of the top. Just like a '13.
It has a curved front fender--must be at least a '17. he he