Hard to tell, but it looks like either an 8 or a 9. In the case of a 9, I am thinking of using the adjacent 6 as a template and flipping it vertically. The bottom loop does not quite look closed on the left side like an 8 would be. It doesn't look like a 0 to me though.
It is a shame that there is damage to the coin....
It is a shame that there is damage to the coin....



















