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Is one of these (the second, I believe) supposed to be copper or bronze?
Correct - the second one is supposed to be either copper or brass.
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What does the writing in the middle of the first coin say?
To translate the inscriptions on the obverse of this coin:
The inscription at the top says "Yunnan province" - which is better than many counterfeit coins can do; counterfeiters often don;t bother matching up the obverse and reverse dies, so the English-language side can say "Yunnan" and the Chinese-language side says "Kwangtung" or some other province.
The inscription at the bottom is the official weight: "Treasury standard 3 mace 6 candareens".
In the middle, the four large Chinese characters are the standard "coin formula", used on Chinese coins since the Tang Dynasty. Top and bottom character's are the emperor's reign-name (Guang Xu or Kuang Hsu), left and right are "yuan bao", one of two CHinese phrases that appear on coins that mean "currency".
The four vertically-written smaller words right in the middle are in Manchu script. The left and right words are the mint name: "Yunnan Mint". The two words in the middle are the emperor's reign-name in Manchu, "Badarangga Doro".
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