Conder Tokens were minted in response to British coin shortages in outlying areas. They are named after James Conder who was an early collector and cataloged these interesting coins. Thousands of varieties of tokens were minted, this one is relatively rare, although rarity in this case does not indicate high value. The collector base for Conder tokens is relatively small, and that keeps prices low.
A good place to educate yourself on Conder tokens is ABC Coins and Tokens in Alnwick, UK. The monogram H M Co means 'Hibernia Mine Company' with partners Turner Camac, John Howard Kyan and John Camac.
worn: $12 US dollars approximate catalog value
average circulated: $25
well preserved: $60
fully uncirculated: $120
There are many varieties of this token. Different spellings and different legends are common, as are inscriptions around the edge of the token. Values do not change much for each variety. Requester trout123 has a interesting variety where COMAC is misspelled CONAC and KYAN is misspelled RYAN.