Look for the embossing on the back of the pin:

STS-8
NASA
ABemblem.com

Bluford became the first African-American to fly in space. INSAT-1B, a multipurpose satellite for India which was attached to the Payload Assist Module-D (PAM-D) motor, was deployed.

Above: Commander Richard H. Truly, Pilot Daniel C. Brandenstein and Mission Specialists Dale A. Gardner, Guion S. Bluford, Jr. and William E. Thornton. Image Credit: NASA