That one is tough to tell from the picture. I would guess that the end cap may be threaded or pressed on. You could also stand the pedals so that the threaded part of the axle is pointing upward and place a few drops of oil into the gap between the axle and the body. I've done this on the swaged Schwinn Approved pedals that are not easily rebuildable with good results.

Oh, I just noticed and should have known better that on these block pedals that the rubber blocks and the pedals are held together by 2 screws.