That is exactly right, although I was doing that before Bowers wrote those words. As for the grades on slabs, I don't take any of them at face value. Some of the "third world grading companies" are scammers who are out to work with other scammers to cheat people. The main services are obviously better, but you are making a big mistake if you believe everything they put on their holders. The "C" (over graded) coins sell for less than than the properly or conservatively graded pieces, at least to people who know what they are doing. AND they are lot harder to sell to dealers unless you discount them below the listed prices.