Need help identify mark at vintage necklace

[uniquefashionjewelryforyou]

Hi, I need help identifying a sign/marking at a vintage necklace. One side says 24 GP which is obvious but the back it is unclear to me. Any help is greatly appreciated! Photo attached

[sophieschoice-vintage]

Could we see a pic of the whole necklace?  That would help, as the clasp and the 24GP mark indicates to me anyway that it might be a newer vintage piece.

Thanks

[uniquefashionjewelryforyou]

Please see photos for whole necklace

[uniquefashionjewelryforyou]

more photos

[uniquefashionjewelryforyou]

I have added 4 photos or the necklace and  both sides of the clasp. Thanks 

[uniquefashionjewelryforyou]

Can someone please help me to identify the mark at the clasp? It is not a new vintage piece for sure!

Any help is greatly appreciated, thanks