The 1917-S Buffalo Nickel is one of the most valuable rare coins, with high-grade specimens selling for up to $138,000. This San Francisco-minted nickel had a low mintage of 4,193,000, making it a sought-after collectible. Learn how to identify, value, and sell this coin for maximum profit. If you own a 1917-S Buffalo Nickel, you could be holding onto a hidden treasure!