Born. To Betty Shabazz, 30, widow of militant Negro Leader Malcolm X who was murdered last February after breaking with the Black Muslims; her fifth and sixth children, twin girls; in Brooklyn.

Born. To King Hassan II, 36, autocratic ruler of trouble-plagued Morocco; and Lalla Latifa, 21, daughter of a Berber tribal chieftain: their third child, second daughter; in Rabat.

Died. Clara Bow, 60, Hollywood's It girl of the '20s; of an apparent heart attack; in West Los Angeles (see SHOW BUSINESS).

Died. Oskar Lange, 61, Poland's Deputy Premier and chief economic planner, leading economist of the Eastern bloc, a onetime U.S. immigrant and University of Chicago economics professor who in 1945 joined the newly formed Polish Communist regime as Ambassador to the U.S. and later to the U.N., in 1956 revolutionized Eastern thinking with a then-heretical plan to revive Poland's floundering economy by decentralization and partial re-introduction of the profit motive; in London, where he had gone for medical treatment.

Died. Harry Reser, 69, oldtime banjoist, whose fur-trimmed Clicquot Club Eskimos kept the NBC airways jingling to the tune of Ain't She Sweet? and Barney Google every week between 1925 and 1933, later strummed for Sammy Kaye; of a heart attack, while tuning up for his nightly performance in the orchestra of Broadway's Fiddler on the Roof; in Manhattan.

Died. Mayo Buckner, 75, inmate since age eight of Iowa's Glenwood State School for the mentally retarded, who received worldwide publicity in 1957 when it was belatedly discovered that he was of superior intelligence and a gifted performer on eight musical instruments, but was by then so disoriented that he was considered incapable of ever adjusting to a normal life, spent the remaining years as a patient with special privileges, teaching music and working in the print shop; of a stroke; in Glenwood, Iowa.

Died. Colby Mitchell Chester, 88, president and then chairman of General Foods Corp., a Wall Street lawyer who took over the presidency of small Postum Cereal in 1924 and began an expansion program that resulted five years later in the merger of 15 food companies, continued to develop ever speedier convenience foods (Minute Rice, JellO, Birds Eye) until sales reached $260 million at his retirement in 1941, $1.5 billion last year; of a heart attack; in Greenwich, Conn.

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