Isegrim seems to be inconsistent in the way it lists multiple specimens of a single issue; sometimes they're combined in one entry, and sometimes they're not. Among multiple triggers for such separate listings I suspect different sizes and
weights play a
part; the first (
BMC) entry is for a coin of 19 mm, and the second is for two or more coins measuring 20 mm instead. Since they share so much else, your 18 mm coin and these others should all probably be assigned to the same
Isegrim entry; would the users of such coins value them any differently based on just a 1 mm discrepancy?