That is the cap. It was caused by a portion of the transfer roll breaking (relief break) it is known in three varieties; cap on left 2, cap on both 2's and cap on right 2 (extremely rare). This break occured on two different transfer roll reliefs.
Don't be too heartbroken -- the 2011 catalog value for a Scott 220c (cap on both 2s) was $32.50 (the 220a (cap on left 2 cataloged at $11). That is a significant premium over the $0.70 Scott 220.
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