help id old chinese? coin

my dad dug up this coin here in texas in about 1980, while builing a porch.... i found it again the other day.... it was black when dad first found it.... but about 10 years ago he cleaned it with brasso and a toohbrush....

thanks for any info.....

 

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Korea. Copper 1 mon. Hojo mint (Treasury Department), 1731 AD. Reference: Mandell 13.2.8.

DO NOT clean any more coins with brasso/toothbrushes. It will ruin modern, machine made coins. Thankfully, this one had some time to recolor in the past decade.

PS - the obverse photo is upside down.

 

thanks for the info.... any value to it??? im guessing its worth a $$million$$$ haha....

 

Less than $5.