The Rawlings "Gibson Mitt" debuted in 1914. It was distinctive in the tapering of the perimeter banding to form a thin leading edge at the top. This was a useful design in scooping up low balls. The face of the mitt was molded and a reinforced wrist strap was added to the back.
Below is the Rawlings patent for this design issued in 1913. Although John Gamble of A.J. Reach patented the molded face mitt in 1906, the inner padding was uniform and not tapered. Gamble's main concern at the time was forming a deep set pocket. The Rawlings design can be seen as an improvement.
This catalog illustration from 1924 shows "The Gibson" scoop model still being manufactured.
The 2 photos below show a Rawlings mitt stamped "The Gibson Mitt" at the heel.
The name "Gibson Mitt" came about as a reference to the star Pittsburgh catcher of the day, George Gibson.