Barry Buschell Sr., 72, who retired last February as a retail advertising account executive with The Washington Post, died Saturday at Mount Vernon Hospital of respiratory failure resulting from complications from cancer. He lived in Mount Vernon.

Mr. Buschell joined The Post in 1950. He was known for his 11-hour work days and his dedication to the job.

"I still get as big a thrill out of selling today as I did 50 years ago," he said in an interview several years ago. His advertising beat included major chain stores, and he carried about 50 accounts.

Born in Brooklyn, N.Y., Mr. Buschell started his career as a classified advertising telephone solicitor with the old New York American in the late 1920s. He later was head of the newspaper's display advertising staff and then resort travel advertising for the New York Daily Mirror before coming here in 1939 to work in the advertising department of the old Washington-Times Herald.

Mr. buschell served with the Navy in World War II. After the war, he sold advertising for the old Washington Daily News and worked briefly for a magazine company in Chicago before joining The Post.

He was a Mason and had been a member of the Variety Club and the Advertising Club of Washington.

His marriage to Frances Winters ended in divorce.

He is survived by his wife, Alberta A., of Mount Vernon; a son, Barry Jr., of Potomac; four sisters, Mary Goldman, Ida Ross and Anna Landau, all of Brooklyn, and Lillie Rubin of Tamarac, Fla., and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.