Got this coin sometime ago for not much, but can't find this on Numista...
Size: 46.5mm, Weight: 21.53g Metal: cast copper
Just haven't been able to pin the era or confirm country. On the bottom of the reverse, there are two raised bumps on the rim where it was attached to a series of other like cast coins...
Not Chinese, but Vietnamese. The obverse inscription reads "Ming Ming" in Chinese, but in Vietnamese the pronunciation is different: Minh Mang, emperor of Vietnam 1820-1840. Vietnam was not making large cash coins for circulation at this time; a few large "presentation pieces" were made and given to the emperor's friends, family and dignitaries. These presentation pieces, signs of approval and prestige, were often copied. Here's the zeno.ru page of Minh Mang presentation coins; I don't see an exact match for your reverse inscription, but given the bewildering array of reverses shown on zeno.ru, that's not necesarily bad news. What is bad news, however, is that I did find an exact match on zeno.ru, filed under "fakes, fantasies and war souvenirs". The reverse is described as a "poetic legend": https://www.zeno.ru/showphoto.php?photo=220118
If this one was attached to a bunch of other cash coins, then I would presume it to be a made-for-ornamentation replica, rather than genuine. In Vietnam, large cash pieces are often hung up in houses as charms.
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