For the OP. I see you are in Viet Nam. And this is the second post you have with Chinese knock offs. Given your proximity to that country, a huge majority of the U.S. classic coins you will see raw like this are likely to be fake. If you are buying them like this, stop! Unless you know EXACTLY what you are doing, you are going to get cheated.
If you have an interest in U.S. coinage, I would highly suggest buying ONLY coins that have been graded by one of the major grading companies, ANACS, ICG, PCGS or NGC. Otherwise you are just going to continue to get junk after junk.