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I've inherited a set of sterling silverware that was originally given to my great-grandparents for their 25th wedding anniversary in 1905. It was purchased from Spaulding & Co. in Chicago. I'm researching the hallmarks and I think that they identify this as being made by Gorham in a pattern (Old French) that was patented in 1904. The mark I don't understand is the H in a diamond to the right of the other marks. What does the 'H' mean? Thank you!