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your guess is my guess as wellHaving 18K and .925 stamped on the same piece of jewelry does not make much sense. What you might have there is a piece of vermeil jewelry. Vermeil is gold plated streling silver. That's my guess?
OK, I might have the dates a little wrong, but maybe you'll just have to do some of your own research (Lol)........In the later half of the 1800's the Gold standard was changed from Karats to percentage Marks. From about 1860-1910 it was admissible to use BOTH Markings, Karat and .925. Around 1910-1920, the British standard for Gold Marks was changed to the Percentage stamp only. (i.e. .925, etc.). I'm fuzzy on this so you'll have to check it. but if the ring is Gold, and you have the Double Marks, it would indicate a Victorian/ Edwardian era. I just remember this from researching a 22 karat Gold ring I found a few months back. It was Hallmarked 1856 and Marked only with the Karat.......This might help, I think you might get a link off this Hallmark Site that will direct you to the registered Makers Marks and Hallmarks. I believe I saw the CAS Hallmark on the registry, but it was in the silversmith's marks. Many of the Metal workers worked in both Metals though.....Google for other Hallmark directories......Happy researching, you'll learn a lot.......Researching British Hallmarks