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Miles, if by converted, you mean something akin to "berryizing", I don't know. This site lists Watts' working period as 1835-1850, the end of which seems to me to be somewhat early for this kind of twisted handle, serrated bowl edge type of work. But such froo-froo is typically later than the era in which I'm mainly interested, and I don't pay much attention to it, so I might well be wrong as to when it started coming into style. Essentially all the "berryizing" I remember seeing is on Brit spoons, usually on Old English or Hanoverian pattern, and was done, I think, in the later nineteenth century. I can't remember seeing it on American spoons, or even much on Brit Fiddle Pattern spoons. I don't think there was much "conversion" done on American spoons at all, certainly not like the amount of "berryizing" done on the Brit work.
I've seen a ton of James Watts flatware, and I've never seen holes in a shell-shaped bowl like that. I think they've been added so the sugar shell or preserve spoon could become a sugar sifter.
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