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Art M.Nice to see Mr. Heitman contributing to the T206 discussions.
I have only seen (and own) one T206 that breaks the pattern of backs issued within specific series.
All of the 350 series cards with American Beauty 350 backs have frames except:
This is the only exception I have identified in 25 years. I own this example and have seen other Nichols (batting) cards with the same no-frame 350 back.