I rarely see Charles II halfpennies come up for sale in the States but I was able to pick this one up for my collection. As it turns out, it is one of the more peculiar (unlisted) varieties. The only other example of this variety I was able to come across online was the one that was in the Dr Basil Nicholson collection.
B/C in Britannia. Die chip under first N? Is there more information out there on this variety that I might be missing? Thanks for looking!
