This tint -- known as toning -- is caused by exposure to contaminants, like dirt, the oil in peoples' fingers, stuff in the air, or from some kind of liquid. The contaminant will chemically react with the metal on the coin's surface and cause it to change color.
There is no such thing as an 1889 Buffalo Nickel. Buffalo nickels were only minted from 1913 to 1938. A nickel minted in 1889 would be a Liberty Head or "V" nickel.
That would be pretty hard to do, because Buffalo nickels were minted from 1913 to 1938.If you mean 1937, a nickel in average condition would retail for a dollar or so. If it shows less wear; e.g. at least half of the buffalo's horn is still visible, that figure might go up to $2 or $2.50
Please check again and post a new question. Buffalo nickels were struck from 1913 to 1938. Any nickel dated 1939 would be a familiar Jefferson nickel. Look at the coin again, 1938 was the last year a Buffalo nickel was made.
Current retail values for a 1937-D buffalo nickel with three legs range from $500 if very worn, up to about $1200 in AU condition. However you would need to have the coin examined in person because there are many counterfeits made by removing the leg from a normal nickel using jeweller's tools.
It would depend on the date of the Buffalo nickel. Post a new question and include the date and mintmark if there is one.
Please check again and post a new question. Buffalo nickels were struck from 1913 to 1938. Any nickel dated 1943 would be a familiar Jefferson nickel.
To a collector it is worth $0.05.
Please check again and post a new question: > Buffalo nickels were made from 1913 to 1938. An 1899 nickel would have a picture of Miss Liberty on the front and the Roman numeral V (= 5) on the back. > All nickels except those from WWII (1942-45) are made of copper-nickel, not silver. > There's no coin called a "buffalo head" nickel. The names are either an Indian Head nickel or a buffalo nickel.
Please check your coin again. It says FIVE CENTS under the buffalo so it's a nickel rather than a penny, and is called either an Indian head nickel or a buffalo nickel; both names are equally common. There's more information at the Related Question.
Please check again and post a new question. Buffalo nickels were struck from 1913 to 1938. Any nickel dated 1945 would be a familiar Jefferson nickel, but made from a special alloy used during wartime.
These were never made out of wood. They would be made on nickel and copper.
Please check your coin again and post a new, separate question. Liberty nickels were minted from 1883 to 1912. A 1938 nickel would be a Jefferson nickel or buffalo nickel.