biolumen

Hello all! I admittingly know very little to nothing about coins, so I'm seeking whomever reads this advice. I found this the other day, I am very curious about it. The condition isn't great, and the year seems to of worn off.. As you can see in the picture there is an "S" on the standing liberty side. (I guess SF?) Thank you to all who can help me, and if you have an idea of an aprox value (if any) please let me know!