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So those dimples are what set it apart from real ones?
That, and other things. The style of the script - the "font", if you like - is quite different to the official script used on the coins. While the Chinese characters on the obverse (dimpled side) are technically correct, the Manchu script on the other side is very badly rendered.
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If they did strike coins during the period these coins represent, why simulate casting?
They did not make struck cash coins until the late 1800s; such machine-struck coins do not have dimpling on them. Prior to this, all cash coins were cast. These copies are machine-struck, because these days, making machine-struck copies is cheaper and easier than making cast copies from sand moulds. The dimples are there to give an at-first-glance similarity to a cast coin.
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Also, if the dimples are put there to simulate cast, why not on the back?
I would attribute that to "laziness". There are many purposes such replica cash coins are sold for - particularly from Feng Shui supply stores (apparently, the demons can't tell the difference between genuine 300 year old cash coins and modern replicas). But I most frequently see this particular variety of replicas glued onto a piece of cardboard in sets of 10, each coin showing a different emperor of the Qing Dynasty.
These guys, for example, sell these replica coins individually, in bundles of three, tied up in assorted lucky arrangements, or in the card-of-ten (about halfway down the page). When they're glued onto a card, only the fronts need to be "realistic-looking", so only the fronts get the dimpling.
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Do you know what these would have been if they actually existed in the first place?
The first coin imitates a coin of the Guang Xu Emperor (ruled 1875-1908). The second is from the Tong Zhi emperor (1861-1875), the third is from the Yong Zheng emperor (1722-1735) while the fourth is from the Shun Zhi emperor (1643-1661). To get a feel of what genuine cash coins look like,
this page is an excellent introduction to Qing Dynasty cash.
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