Hello, unfortunately your item is only made of silver, I could see the wear revealing the yellow alloy and the “EP” tag on the Electro Plate.
Hi to me the yellow looks like a tarnished glaze of some sort.
I’m sure the yellow ones are wear from the silver plating, the biggest one sitting in the first photo. The “EP” I mentioned is in the third photo.
Yes, it’s definitely electroplate. In addition to the EP mark mentioned by apcmetal I see the trade mark of James Deakin & Sons of Sheffield with their very distinctive table lamp mark used on electroplate.
Thank you very much to the both of you