From our US Coin Facts page on this Fourm:
Standing Liberty Quarter General Grading StandardsG4 Good - Date and lettering readable. Top of date worn. Liberty's right leg and toes worn off. Left leg and drapery lines show much wear.
VG8 Very Good - Distinct date. Toes show faintly. Drapery lines visible above her left leg.
F12 Fine - High curve of right leg flat from thigh to ankle. Left leg shows only slight wear. Drapery lines over right thigh can be seen only at sides of leg.
VF20 Very Fine - Garment line across right leg will be worn but show at sides.
EF40 Extremely Fine - Flattened only at high spots. Her toes are sharp. Drapery lines across right leg are evident.
AU50 About Uncirculated - Slight trace of wear on head, knee cap, shield's center, and the highest point on the eagle's body.
MS60 Uncirculated - No trace of wear but can have many contact marks. Surface may be spotted, or luster faded.
MS63 Select Uncirculated - No trace of wear. Light blemishes. Attractive mint luster.
Unfortunately due to the date obscurity, I have to go with AG-3 on this one.

It does have close to F details on the obverse.