If it has one it's on the reverse under FIVE CENTS
Buffalo nickel was created in 1913.
Any Buffalo nickel with no mintmark was struck in Philadelphia. Nickels did not have a "P" mintmark until 1980.
The last Buffalo nickel was made in 1938. A 1942 dated Jefferson that has a large mintmark on the reverse is 35% silver and worth about $1.00. If it does not have the large mintmark just spend it.
Look at the coin again, the first Buffalo nickel was made in 1913.
Buffalo nickels were minted from 1913 to 1938
Buffalo nickels were minted from 1913 to 1938
Buffalo nickels were minted 1913-1938.
5 Cents "Buffalo Nickel" 1913-1938
1913 was the first year of issue for the Buffalo nickel. It was struck at all 3 Mints, with 2 different reverses, so 6 different Buffalo nickels exist all dated 1913. The values are very different. Depending on type and mintmark, values run from $30.00 to more the $300.00. So the best thing to do is take it to a coin dealer for a better idea of the value.
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.
There are 6 different Indian Head nickels dated 1913. The type (1 or 2) and mintmark are needed for an accurate assessment because values for the coin in the low grade of G-4 are $5.00-$300.00 depending on the type and mintmark of the coin. Please post new question
A 1920 Buffalo nickel is common, assuming it's circulated and has no mintmark values for coins in average circulated condition are $2.00-$8.00.