No idea what that is, but it is not original. The magazine rack is not factory original, either, so I suspect a previous owner was doing something. Who knows what?
We have had three 2720SLs. The first two each had a comfy chair. I don't think the South Dakota factory is including them any more. Those chairs were not recliners, and they were not restrained in any way.
I can't quite tell what the screw head looks like. As you say, it may be a security screw. You can buy a set of security screwdrivers from Harbor Freight for not much. One of them ought to match what you have.
Let us know.
Bill
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