Like all gold coins today, yours is a valuable piece. Does it look like the picture I've supplied, with lots of frosty, creamy luster? Or is it more shiny or polished looking? The frosty, lustrous look is desirable. The polished look is not. A dull look is less valuable.
NEVER CLEAN A COIN. CLEANING RUINS VALUE.
Your coin contains 0.0981 troy ounces of gold, so that makes it worth a minimum of $100 (US dollars) at gold prices as of this writing. Check web sites like kitco.com for the latest gold price. It changes every day.
A good rule of thumb for these coins is to multiply the current value of gold in troy ounces (available on web sites like kitco.com) by 0.0981, and then add $50 for worn coins or $150 for undamaged, nice-looking coins. If you have one that is fully lustrous and uncirculated, you can add $300 for coins dated after 1880, and a whopping $1000 for coins dated before 1880.
Coins dated 1880 in this series are extremely rare. Figure $1000 even in worn condition. Hope you have one!