Hi thank you for writing in. Let's try and tackle your first question which I believe is the one in the heading title box.
Most probably the 4 kp is 14 kp, perhaps you are unable to see the first number of the karat mark clearly (you could try using a magnifying glass or jewelers loupe) or the mark may have faded away over time, which I doubt, as k followed by p was only introduced in 1978.
It just may have been worn a lot! Regardless, the karat mark followed by the letters "kp" was a guarantee from the manufacturer that the metal composition was no more or no less than 14 k (or whatever the carat mark might be). It means PLUMB Gold.
Some people mistake this mark for gold plate.
To save confusion could you please post your second question in a new submission.