Joseph Freschi, 70, a retired photostat supervisor with the Government Printing Office who had been a noted sandlot baseball player in Washington, died following a stroke Saturday at the Fairfax Hospital, where he had undergone open-heart surgery.

In 1934, Mr. Freschi went to work as photostat supervisor with the National Recovery Administration. He was hired by the late Gen. Hugh Johnson, head of the NRA, who was putting together a sandlot baseball team capable of challenging the top-rated team of the Federal Bureau of Investigation. At that time, Mr. Freschi was considered one of the best all-around players in Washington.

Competition between the NRA and FBI teams included the attendance at many games of then FBI director J. Edgar Hoover and assistant director Cyclde A. Tolson, who would sit opposite Gen. Johnson. At one time or another, Mr. Freschi played every position except cotcher.

Mr. Freschi worked for the GPO after leaving the NRA. He retired in 1969.

He was born at home on the site of the present Department of Commerce building, where his family owned and operated a grocery store. He worked at the site where he was born when he joined the NRA, which was then located there.

Mr. Freschi also was a champion bowler, and with his wife won many husband-wife tournaments in the city.

Survivors include his wife, Audrey Costello Freschi, and a son, Jay Freschi, of Alexandria; two sisters, Angela Lassister, with whom he resided in Falls Church, and Mary Rinaldi, of Maryland: a brother, Louis Freschi, also of Maryland, and five grandchildren.