It is almost impossible to consistantly grade hammered coins. I consider them to be poor, OK or nice. The grade of a hammered will depend on the flan shape , central striking , depth of strike, flan clipping etc There are also differences down to quality of silver ie a EF Henry V111 in debased silver will not match a lesser grade Fine silver issue Edward V1. Even with Ed 1 pennies the early issues are not as asthetically nice. Before the advent of the internet and glossy dealer catalogues I used to buy hammered on the strength of the dealers grades. Quite a few of these were returned. I now only buy on the strength of good pictures or in hand inspection.