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I believe these were retailed by a curio shop in Yokohama.
Watanabe’s curio shop (渡邊美術店, literally translated, “Watanabe Fine Art Store”) was established in 1879 by WATANABE Chozo 渡邊長蔵 in Sumiyoshi-cho, Yokohama; later it moved to 2 chome Bentendori, and was listed at that address in the 1920 Japan Trading Guidance (i.e., The Japan Trade Guide) published by Tsusho Kyokwai Teikoku.
If anything, the loss of the wire "whiskers" would suggest these pieces are sterling, which is usually much softer than silverplate. Impossible to determine, of course, from photos alone.
Is it possible for Japanese items that are marked jungin to be silverplate? I assumed that the mark was reserved for high purity silver pieces. Is it more complicated than that?
It would be highly unlikely for a silverplated item to bear a jungin mark.
As far as I know, the Japanese never tried to pass off silverplate as pure silver by applying false marks, and the market for Japanese silver has not yet been flooded with spuriously marked fakes as have other markets.