Probably why they no longer give them a numerical grade is the fact that most of the non-square frame subjects which are the only true blank back T204's are in fact early two-part cards that had the front and back adhered to each other and separated later in life due to moisture or damp environments. These early two-part cards are very scarce.
Most collectors are unaware of the two-part T204's and often buy these "blank back" cards thinking they are a scarce error when in fact they are not. Again, Anderson, Bancroft, Bransfield, Burkett, Dineen and Moran can and do come with blank backs and were made that way. If one had one of these blank backs and one of the supposed blank backs in hand they will find a difference in stock thickness.
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