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I take it from the Silverplate Numbers entry that the "10" here would indicate 10 grams used on this 5" fork rather than a total used per a gross bath. Also, can we confirm "Flat Rose" to be an official pattern name?

Errata: Magnus (I hate touch screens!)

Flat Rose is the name of the pattern that I've seen used. If it were Sterling (or .830 used commonly with MA) I would expect a 5" 2 prong fork to be around 15 to 20 grams, give or take, so I'd think that 10 grams on one silverplate fork unlikely.