To re-enforce this hypothesis, some automatic mvt, like the Seiko 7S26, just don't have the mecanism and the possibilty to manually wind them, you can only shake them (swirl them), and that's it. These mvt are known for their robustest and broke very rarely, one of the best mvt out there. Not elegent, but they are very well built, no xtra stuff gears, less is more.
On page 5 you will see how to wind an automatic mvt that don't have the manual winding mecanism:
hxxp://www.seikowatches.com/support/ib/pdf/SEIKO_7S26_35_36.pdf