Sewell W. Dixon, 79, a minor league baseball owner player in the 1920s who owned and operated a charter fishing boat in Annapolis for 50 years before retiring in 1980, died of pneumonia Sunday in Anne Arundel General Hospital in Annapolis.

Mr. Dixon owned the Betty Sue, a 42-foot cabin cruiser on which he took parties of vacationers and sports fishermen.

He was a lifelong resident of Galesville, which is near Annapolis. He was a member of the Galesville United Methodist Church and a charter member of the Galesville Volunteer Fire Department.

In the early 1920s, Mr. Dixon played minor league baseball for the old Baltimore Orioles minor league team and later for minor league teams in New York and Pennsylvania.

Survivors include his wife, Agnes Smith Dixon of Galesville; two sons, Charles C. and Sewell W. Dixon Jr., both of Galesville; four daughters, Brenda D. Perry of Lothian, Md., Borothy D. Chaney of Harwood, Md., and Betty D. Moreland and Sue D. Hines, both of Galesville; two brothers, Frank W. and George W., both of Galesville; two sisters, Doris D. Hardesty of Winter Haven, Fla., and Thelma D. Brunner of San Antonio, Tex.; 18 grandchildren, and six great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Galesville United Methodist Church or to the charity of one's choice.