At that weight, they'd all be base-metal reproductions. These things are imported in bulk from China, where counterfeiting old coins is not only perfectly legal, it's a major cottage industry.
The tael is supposed to be even heavier than a dollar, at around 32 grams. I'm not even sure if that particular design was ever actually issued; if it was, they're extremely rare. The only reference I could find to it was here
on zeno.ru's catalogue of fantasy pieces.
And sadly, many of the Chinese dollars you see for sale on eBay are fakes, too. Especially if being sold from China.
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