$10 Liberty Gold Coins XF
"XF" is a contraction for the denotation of "Extremely Fine" on the Sheldon Scale, which was developed in 1949 by Dr. William Herbert Sheldon, and ranges from 1 on the low end to 70 on the high end. XF coins tend to fall in the 35-45 range. If a $10 Liberty gold piece is graded Extremely Fine, that means that the coin saw use as a currency piece and was traded among citizens for goods and services.
Specifics of the Grade
Regarding the $10 Liberty gold coin, a specimen in the Extremely Fine range of grades will show use and be scuffed and worn. There will probably be small dents or scratches in the coin's details, most likely including the coronet wearing "Lady Liberty" on the front or the shielded eagle on the back of the coin. More than likely "Bag marks" will be present as well. Bag marks occur when gold coins are held in a sack (Usually in a banker's vault) and the coins at the bottom of the bag are rubbed against by the coins at the top of the bank bag.