It should be pointed out that these are not the most-common-seen fakes, of Chinese dollars, These are smaller. Most have a weight of "1 mace 4.4 candareens"; this is one-fifth of the weight of the dollar (7 mace 2 candareens), which makes them 20 cent pieces.
There is one there that isn't Chinese: the smallest one, with British King Edward VII's portrait on the obverse. Looks like it's a Straits Settlements half-cent or quarter-cent; "Straits Settlements" were what we now call Malaysia and Singapore. The problem is, such coins are supposed to be bronze, and that coin looks as silvery as all the others.
The two with the map of Taiwan on it are more recent than the rest; they are Taiwan 50 cent coins from 1949.
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