If I buy a 1991 Canada maple 1oz gold bullion coin, if it is not shiny and is dull in color and has scratches and bents on it. Will it affect its value compared to another same bullion coin minted in recent years that is very shiny without any scratches and bents when I want to sell it? This coin does not has the "20 years ans." on the reverse of the coin, will it affect the value and this coin geniune or not? Can anyone tell me more about this "20years ans" ? Also, who can I sell it to at market rates as banks offer prices below market rates and only buy back coins that they sold in the first place?