I just got a reply from PSA. Here is what they say. The first response was "Yes, cards 1-180 have both gray and white". So I asked them if they had, in fact, graded a gray back 11 dated 1955.
Hello Jim
I can confirm that we do have specs for a gray back 1956 Topps 11 Cubs Team with date, however, we have not actually graded or authenticated these items previously.
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