For what it's worth, I've noticed three variations in the "1971" stadium pinbacks: Version one measures 2.25" across and has matte finish. Version two measures 3" across and also has matte finish. Version three measures 3.5" across and has glossy finish.
There is a similar style of pinback that shouldn't be mistaken for this group--they have different cropping, inferior printing, feature a different autograph printed in black, have a high gloss finish and an easel back. They also measure 3.5" across (see below for comparison of Billy Williams and Ron Santo versions)
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