This is a Vintage HINSDALE MFG. CO. No. SR26, 1/2" Drive, 13/16" 12-Point Socket. It is Marked "-13/16 BOB-CAT SR26-".  It is 1 9/16" long x 1.095" dia. 

As Per Research I See Bob-Cat was a Line of Tools Produced by the Hinsdale Mfg. Co. It has No Dings or Cracks. 

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