The safety has been filled. And it looks like quite recently. The factory also would do it this way at times when a gun was ordered without a safety and then the filled area would be engraved over. Or they would make a frame with no slot in it.
The fill is yours could just be some soft solder or filler material of some sort. Parker would have used steel to match the frame so it could be finished to match.
If you wanted to put it back to having a working safety it could be done. How much is involved depends on what exactly was done. You wouldn't know this until the action is removed from the stock. And you are missing all the parts for the safety, which would have to be put back in.
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B. Dudley
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