S and P aren't grades, they're mint marks indicating where a coin was struck. There are many other possible mint marks for U.S. coins as well, depending on their denomination and date.
i guess it' s like not a final grade? mAybe :P
Super
It's called a mint mark and identifies the facility where the coin was minted. Modern circulation coins use P for Philadelphia and D for Denver.Proof coins may have an S for San Francisco and bullion coins may have a W for West Point.Other mint marks have been used in the past. Tracking them all can become quite complicated.
All the Washington Quarters minted in the year 1989 carried a mint mark: "P," "S," or "D." The P and D minted coins are worth in MS60 condition: 75 cents; the S coin was minted only in proof and its value is: $3.00.
Matte proof coins are special proofs that have a grainy "sandblasted" look on the surface. Matte proof coins were sometimes made in the early part of the 1900's. Normal proof coins have a mirror like brilliant surface.
The U.S. does not have any "F" mintmarks. Only P-D-S & W for any coins.
In the grade of MS-60, the P & D mint coins are $1.27 the S mint are $1.38
i guess it' s like not a final grade? mAybe :P
The 1914-S is a better date Barber dime retail values for circulated coins are $2.00-$5.00 for low grade coins $10.00-$40.00 for mid grade and the higher grade coins are $75.00-$115.00
P. N. Breton has written: 'List of corrected approximate values of Canadian coins and tokens' -- subject(s): Canadian Coins, Coins, Coins, Canadian, Medals, Prices
Super
17 S in a H P
In a letter, "P. S." means "Post Script."
For 1939-S Walking Liberty halves, average circulated coins (below EF-40 grade) are valued at $15.00-$20.00. The better grade circulated coins are $30.00 to $90.00. Mint state coins start at $100.00. Value depends on the grade of any coin. I suggest having the coin graded for a accurate value.
Satisfactory
Brilliant uncirculated coins sell for 50 cents or more, depending on the grade of the coins. Brown coins are 10 to 25 cents.
P. Alan Rayner has written: 'The designers & engravers of the English milled coinage, 1662-1953' -- subject(s): Numismatics 'English silver coinage from 1649' -- subject(s): British Coins, Silver coins