I don't think the fourth word is 'of', as there's no letter like the 'f' in counterfeit. Instead I wonder if it's 'etc' (written &c or +c), signifying that the formal definition of the offence continues with something such as 'or tendering' but there wasn't room to write it all.
And (as ShaunJ wrote while I was typing) rather than referring to a single piece of unspecified value, 'coin' could be a generic or collective term, as in 'coin of the realm'.
