ID Help: Coin? Token? Button? Era?

What is this thing? Civil War Button of some sort? It's about the size of a Nickel. What are those Asian characters? Any help wiht IDing this will be greatly appreciated. Thanks.



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Comments
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don
Could it be a button from a uniform of the newly westernized Japanese army??
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It could be a Japanese button or perhaps a button made by a Chinese company in the US. It would be nice to know something about the lion-thing on the front of the button. That might be an important clue...