Some Hamiltons have this little clip over the winding arbor, and some do not even though they have the cutouts. Many believe these parts were in all Hamiltons that called for them, and that they have been lost by watchmakers over the years. Maybe, but I have seen very close to mint movements that were missing this clip. At any rate, the part isn't essential as far as I can tell.
Also note the post that locks the main wheel. With this arrangement no main wheel washer and no left handed screw is needed.
See the album for this watch here:
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