Take the coin to a dealer or look in a book on coins for the value.
Modified coins have no collector value. Any value would be associated with the necklace.
Banks will happily buy gold coins for their face value - since this is nearly always far less than they are actually worth. If you wish to sell your coins for their actual value, take them to a reputable goldsmith.
3.5 grams
Firstly the coin is not made from silver and brass. The centre is of a golden coloured alloy and the ring of an silver coloured alloy. Secondly, as for value, that depends on the rarity of the coin. There is much hype on the value of the R5 Mandela coins. I think only a select few coins are really valuable. The rest are mere circulation coins with a value equal to its face value, for now anyway. Who knows how much such circulation coins will be worth in 50 years time? I think a lot of people spending a lot of money on Mandela R5 coins will be disappointed. Caveat emptor.
Take the coin to a dealer or look in a book on coins for the value.
No dollar coins were made after 1935, Please look at the coins denomination again.
There were no $1 US coins minted for circulation from 1804 to 1835 inclusive
Some banks have them, where they can be purchased at face value. Otherwise, look on eBay.
No, Mexico and Argentina have different coins.
In Mexico, coins that retain value include the peso (MXN) and its denominations, such as the 5, 10, 20, and 50 centavos, as well as the 1, 2, 5, 10, 20, and 50 pesos. Additionally, collectible coins, such as silver pesos and commemorative editions, can also hold significant value among collectors. It's important to note that the value of coins can fluctuate based on demand, rarity, and condition.
You can, but you shouldn't. Polish damages the coins' surface. While they may look nice for a while, the damage will accelerate any future deterioration and reduce the coins' value, often significantly.
it is illegal in Mexico to take coins to other countries
No gold coins were struck in 1928, please look at the date again. 1929 was the only year the coins were struck.
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
These coins are very common and are worth face value.
You don't. The company is fraudulant. It's run by a guy who grades his own coins, touches them with his fingers, and grades everything at proof/MS 70. He sells these coins on Ebay under the name numismaticbureau