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Dave Mason was traded on Sep 4, 1974, when the New England Patriots sent Dave Mason to the Green Bay Packers.
The Packers acquired Dave Mason from the Patriots for a 1975 tenth-round pick.
Dave Mason has been traded once in his NFL career: Sep 4, 1974: New England Patriots → Green Bay Packers.
Based on his trade history: New England Patriots, Green Bay Packers.
To acquire Dave Mason on Sep 4, 1974, the Green Bay Packers sent 1975 10th-round pick No. 244 (originally GB) — became Bill Cooke to the New England Patriots.
Sep 4, 1974: New England Patriots → Green Bay Packers.