Necklace mark:crowsnest key telephone/XP/Bale Mark

This is a mysterious Vtg necklace but that adds to the beauty in my opinion. The front is marked “crows nest key telephone. “ The back is marked XP. There is a gold mark on the bale but cannot read it Since my magnifying tools were stolen. Very bright shiny gold color. The chain can be changed if desired. But it is very beautiful and rare, I wish I had another one so you could have one and I could have one! Unisex