In this case, the answer can only be even more vague.
The mark with the letters FP may correspond to the mark number 424, that belongs to one of the unidentified assayer of the seventeenth century. The other mark can be the number 487.
Here, the book reads that could be attributed to one of three silversmiths listed, ranging between the beginning and the end of the seventeenth century.
As you can see a very vague answer.
Regards
Amena
