until last year the only way to get a problem coin in a slab was to either send it to ANACS or NCS. These two companies (NCS was part of NGC company) would put a numerical grade but list the problem on the label. NGC and PCGS wouldn't even put the coin in a slab if it was a problem coin, they would just send it back to you in a flip (called a body bag by collectors) and keep the grading fee you paid. Last year NGC and PCGS started putting these problem coins in slabs but PCGS will not assign a grade just let you know it is an authentic coin (which is what allot want to know especially on key date coins, the old way you still didn't know if it was authentic or not if they thought it had problems) NGC I think will assign a grade the same way NCS used to do but put the problem on the label. ANACS is still the same way it always has been, they will grade and encapsulate any coin as long as its authentic but if it has problems they will put what they feel the problem is on the label