I am far from an expert but what bothers me about your example is that it resembles " long square foot spade money" but I see nothing similar to the triangular cut outs at the bottom. Granted, some feet are pointed or rounded but nothing triangular like yours. I'm thinking some type of contemporary replica.
I have also some wooden tallies and many older spades and knifes. The metal does not look like 2000 years old metal but I have not managed to find any similar ones. The metal of this item does not look like copper, it's some how too dark. I think I will check Zeno next.