Those are unfitted Parker buttplate screws. The same screws that would have been used for a DHBP or the top screw on an SSBP. They just would have had their heads filed in those applications.
Every silvers pad that i have had to remove that was factory installed had those same unfitted screws holding it on. That, combined with the fact that there is no additional screw holes in the wood suggests it is factory installed.
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B. Dudley
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