I'm going to put a copy of this in the Hamilton Forum. You may have better luck finding some information about it there. I can tell you that the 25 year warranty pertained to the glod-filled cases guarantee against wearing away to show the base metal. I think the longest term offered was 30 years so yours would be one of the thicker layers made. It's not as valuable as solid gold, and unfortunately ladies watches don't command the same premium as men's watches do. A better focused picture of the movement may help with identification and dating.