Based on your identification of the grass blade, coin could be somewhere between Fine-12 and Very Fine-20, based on Ruddy's Photograde.
Description of both
Fine (F-12): Obverse: about two-thirds of the hair detail will show. The hair will be smooth above Liberty's forehead, the top of her head, and to the left of her neck. Reverse: Some of the leaves will show individual separation.
Very Fine (VF-20): Obverse: Almost all the hair will be visible but will be worn flat on the higher points. (Note: coins made over 150 years ago were often unevenly struck or have imperfections that cannot be standardized in any grading book. Reverse: Each individual leaf will be well defined with little detail showing.
Meaning at the least this is a several hundred dollar coin. But to get that in today's market would have to be slabbed. I'd suggest ANACS for this one, as it is a dug coin.
And I should not have suggested nail polish remover, as that is not as potent. Do buy a pint of acetone at a paint shop or home building store. A pint container kept tightly shut when not in use should last for several years, and is good for cleaning all your dug coins.
Given a cleaned coin and better photos, would attempt to give a more accurate grade than above. There is wiggle-room in this range for this coin, and it might grade higher for some people.
Coin really needs additional conservation/cleaning, even just to obtain a good grade.
