The obverse is a typical card-game counter from the mid-1800s. I suspect somebody running a small-time gambling operation purchased a bunch of these with blank reverses then stamped his own mark on them.
Given the mostly-illegal status of card-gambling back then, nobody would have kept records; I doubt we'll ever know what the "WD" stands for.
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