The coin is an English penny, and was struck during WIlliam I's reign, which is the 1066-1087 window. While the coin does not have a date on it, and mediaeval coins rarely can be narrowed down to a single year of issue, archaeological evidence points to a period of issue for the PAXS type of circa 1083 to 1086.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis