I suspect this may be a "swing ring" case. If you don't see signs of a separate back, you need to unscrew and remove the bezel. Then pull the crown out to the setting position and you should be able to swing the inner movement ring out the front (do you see the hinge at the top of the ring?). There is usually a thumbnail slot at the bottom of the ring, below the seconds bit and you have to be very careful not to slip or you might break of the second hand and its pivot. When you fold the ring back in after inspecting the movement give the crown/stem a gentle turn as the movement drops in to be sure the square is properly engaging the winding/setting mechanism in the movement.
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