Chambellan designed this medal for the Allegheny Ludlum Steel company that was formed in 1938 by the merger of the Allegheny Steel Company of Brackenridge, Pennsylvania and the Ludlum Steel Company of Watervliet, New York. In 1996 it became part of Allegheny Technologies. I found a newspaper reference to the medal being awarded in 1946, which dates it to the period between 1938 and 1946. Dick Johnson dates it to 1946.
The obverse bears a bare chested steel worker wearing insulated gloves wielding a long rod, with machinery in the background. Above, THE PRESIDENT'S MEDAL; signed CHAMBELLAN / SC. The reverse bears a branch and a star with the embedded letters A-L. Around, ALLEGHENY LUDLUM AWARD; dedication in center, TO HONOR DISTINGUISHED SERVICE AND OUTSTANDING ACHIEVEMENT.
This bronze medal has a diameter of 98mm (3 7/8in). It was struck by the Medallic Art Company but it does not bear a maker's mark, maybe due to the chrome plating.
References: MACo 1946-013