Grandmother's Wedding Bands

I recently have been handed down my deceased grandmother's wedding bands. They are white gold/or platinum? I am really not familiar at all with antique jewelry but am very curious as to the origins of my grandmother's ring and was wondering if anyone could point me in the direction of finding more out.

The engangment band part of the ring has something written on the inside that is pretty worn... all I can really make out is that it has K. KA ???? something... maybe ending in 12K. The wedding band part of the set has 14KPAT and then a few weird worn markings kind of resembling an L.


I know this isn't very much or very definitive info on the ring but it's all I have... I would appreciate any help or info that anyone might be able to give me!

Thanks,
Amy