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Tomif you don't slab cards that have been trimmed, rebacked, missing parts, re-colored or other things as 'authentic' then what would we slab as such?  I think that it would be good to slab them with the reason for the 'authentic' grade listed.  They're entombed (for a while.....till Scott or Tbob cracks them) with what the reason that there was no assigned grade.  Still in a nice holder with black insert and slabbed as 'authentic' while rebacked (my OJ Anson).  Now.....debate as to if 'authentic' could be given for anything that has something added to it--such as color or paper--backing or for rebuilding corners might be valid (the debate that is).  Maybe anything rebacked or colored or with paper added couldn't get the 'authentic' designation but I would DEFINITELY want trimmed cards to be slabbed as such.  Just comments from the peanut gallery...........