I think '98 was the last year we (NC) had a 4 bird limit before it went to 3. The info below, while only the proposal, was the bag limit adopted by us- best to my recollection. I do, however, remember the "bonus" scaup limit in the early 80's.
Atlantic Flyway–(Connecticut, Delaware, Florida, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, and West Virginia) Ducks–A hunting season of not more than 60 days between October 1, 1998, and January 20, 1999. The proposed daily bag limit is six and may include no more than four scaup, four mallards (two hens), two wood ducks, two redheads, one black duck, one pintail, one mottled duck, one fulvous whistling duck, one canvasback, and four scoters.