There is another book referred to as "Ehrhardt's Trade Marks" which I believe is rather better, but I have been looking for a copy for two years without success. I have a book called "History of the American Watch Case" by Warren Niebling which contains some trademarks, but the book is far from a complete reference (it doesn't even mention Waltham Watch Case Co !!!) and it says nothing about karatage marks, and it's pretty difficult to use for reference. My practice has been to check specific marks here, and then slowly to learn which marks mean what! So presumably that applies to yours tooĪmerican "hallmarks" are problematic because there was no legally enforced marking system. My second photo shows the "Waltham" mark only, and I have been assured by knowledgeable people here that this is a 10K solid gold case. If there is an accompanying mark (as shown on my first photo below) this would show that the case is 14K solid gold. ![]() The trademark in your photo is one of the correct marks for the Waltham Watch Case Co.
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