I had an explanation of these (and what they were) that I can't seem to find. They are each roughly 1/2 inch tall and 1/4 inch wide. From what I recall from the original, they were in use just before the Japanese converted everything to Western coinage.
If someone else doesn't know, which I promise someone does, I'll ping my JP TL. I can't read very much in Kanji, I think it says something about a flat rate but heck if I know
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