How do I get this drain off the tub??

Here is a metal overflow drain on an old porcelain tub i am refinishing. This is the overflow drain plate on the front of the tub below the faucet. (not the tub drain on the bottom of the tub) I would like to get it off the tub so i refinish the tub and put a new one on. No luck sofar. Is it built into the tub? Is there a screw in the middle? There may be, but it looks hacked off.

overflow drain

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