Broadly speaking, yes. Chinese law only prohibits copies of PRC coins - anything else (including older imperial Chinese coins) is fair game. That said, such coins (or, at least copies of US Coins) can't knowingly be sold in the United States without breaking US law.
No, a genuine Continental currency coin would not have the word "copy" on it. If a coin has "copy" marked on it, it is likely a replica or counterfeit coin. Authentic Continental currency coins were issued during the American Revolution and did not include such markings.
It means it's not real! A copy is exactly that, a replica of the real thing. However, it's not considered a counterfeit because the maker followed the law and marked the coin with COPY to indicate that there is no intent to deceive anyone about its origin. It's a bit like a print of a famous painting.
All replica coins sold in the USA are required to be marked with the word "COPY" in a conspicuous location on the coin. If a replica does not have the word "COPY", then it is a counterfeit.
It depends if it's struck in silver or base metal, take to a coin dealer but don't expect much.
worth of ceaae coin copy
No, unless the Chinese copy has broken the copy protection of the original.
Because it's a copy.
It is impossible to say. Copy coins are made out of a wide variety of materials. A copy coin contains no collector value, but it may be made out of precious metals that could make it be worth something. However, there is no set standard for copy coins, the vast majority of copy "gold" coins are gold plated copper or another base metal, making them nearly worthless. However, there are some gold copy coins made out of solid gold making them be worth a substantial amount of money. Without examining the coin in hand, it is impossible to tell you if you have a coin worth 20 cents or a coin worth $250.
If it's a copy, it's not worth much of anything. It's probably made of copper, or maybe even zinc, then gold plating. You might be able to get a couple dollars for it.
Because it's a copy, not a genuine gold coin.
What's a 1870 twenty dollar copy coin worth
A copy of anything is not worth much. It is not real and is a copy.