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PCThe image is the same used on the 1921 and 1927 Exhibits, but the plate has his signature floating to the left side (the right side on the plate), so it is not the plate used for those Exhibits.
However, Cobb appears in a number of other Exhibit sets that I have not seen an image for -- e.g., the 1922 Eastern Exhibits, the 1925, 26 and 27 Exhibits, the 1926-29 Postcard Back Exhibits, and 1980 HOF Exhibits. The 1980 set sppears to feature signatures similar to the Cobb plate.