52.33% pure gold
925 is 92.5% Pure Silver, commonly known as Sterling Silver.
Heavy Gold electroplate - electrolytic plating of gold plating with a minimum thickness of 2.5 microns, may be marked or described as heavy gold electroplate or heavy gold electroplated.
It was designed by Edco fashion jewelry wholesalers. Their designs are often sold on cruiseships.
It is a brand. W & B MAZZA & SONS