Probably be worth more if it was a forgery. I have never come across any W&M copper forgeries. Come to think of it I haven't seen any Wm III copper ones either (though I have got one in lead from what looks like genuine dies). There were so many made at that time (£700 tons of copper coin made 1694-1701) that there was not the shortage of the mid- to late-18th century that triggered that huge production of copper forgeries.