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...20 cent (1 Mace and 44 Candareens)...
It's "4.4 candareens". The Westernized Chinese weight system was decimal: 10 cash to a candareen, 10 candareens to a mace, 10 mace to a tael. The weight given on the Chinese side translates to "Treasury Standard 1 mace 4 candareens 4 cash".
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Krause has many different varieties, but with no descriptions. I know this is KM#143a, but which one 7-13?
The differences are mainly in the cyclical date. The two CD characters are the ones at 10 and 2 o'clock on the obverse (Chinese side). Looking up these two characters in the cyclical date table given at the front of the China listing in Krause, we see this coin is dated 1900. That limits us to KM# 143a.4 or 143a.5. Subtype 4 is "old dragon with long face", subtype 5 is "new dragon". There aren't any 1900-dated 20 cents on zeno.ru, but
this example from 1899 is presumably "old", and
this example from 1901 is presumably "new". On that basis, yours is "new", and therefore KM# 143a.5 - which is the scarcer of the two subtypes.
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Also, if you know of a good book for Chinese coins.
The book most often quoted for Chinese Empire and Republic machine-struck pieces is
Kann - three volumes.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis