Inventory code: GM21
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Deadstock / never worn or washed / no dry rot.  The short sleeve blue version of this tee is on the Giant tag and dated 1998.  The longsleeve black are either on Alstyle or Giant, but neither version is dated.     
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Size: Tag reads L (see measurements)
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21.5" pit to pit
30.5" back of collar to bottom (front)