Jaime Hernandez: The 1948-P Lincoln cent is very difficult to find in grades of MS65 and higher.
In grades of MS66, it compares to the 1946P, 47P, 49P, 50P, 51P, 52P and 53P.
In MS67 grades the 1948-P is almost unheard of, with less than 10 exmples known and none being higher.