Can you tell me about it? [gelöst]

It is american, it is worn, no date visible and the other side is missing....

Please read the guidelines:
https://en.numista.com/forum/topic71935.html

Regardless, yours is a common Buffalo Nickel, worth barely more than face value without the date I'm afraid.
https://en.numista.com/catalogue/pieces1109.html

If your coin's reverse has "raised" ground then you know it's 1913... otherwise it could be any year.
This is why we request photos of both sides!

I thank you