The 1957-P Roosevelt Dime is really common. It has the largest mintage from 1947 to 1958. Over 160 million examples were struck and just about anyone can buy one very inexpensively and close to the spot price of silver. Without Full Bands it is very common up to about MS66 condition and it begins to be scarce in MS67 grade and higher. With the Full Bands designation it is scarce in any condition. In MS67 with Full Bands it is very hard to obtain and it looks like a very undervalued coin since very few are have been found in this condition or higher.