Within all my wheat pennies, i have found 2 1936 pennies that are missing the straight leg of the "R" in LIBERTY also, i have found 6 1957D pennies (out of about 40 1957D's) that have the lower enclosed part of the "B" in LIBERTY filled in, in one case, i have one 1957D that has that, and the enclosed part of the "9" in "1957" is filled in has anyone encountered these? and if so, any sort of premium?