PRESUMED DEAD. Calvin Simmons, 32, maestro of the Oakland Symphony Orchestra; missing after a canoeing accident on Connery Pond, near Lake Placid, N.Y. Simmons conducted at England's prestigious Glyndebourne Festival and led many of the major orchestras in the U.S. He gained acclaim for his dynamism and adventurous programming. This month he was to have conducted a work of his favorite composer, Mozart's The Magic Flute, at the New York City Opera. Said Beverly Sills: "Cal had so much to offer. I just can't take it in."

DIED. Kazuo Iwama, 63, president of Sony Corp. for the past six years and a key executive in the growth of the worldwide electronics giant; of cancer; in Tokyo. Iwama joined the company in 1946 and helped lead Sony into mass production of transistorized radios that touched off the Japanese semiconductor industry. Under his guidance, Sony became the first Japanese electronics company to build a color TV manufacturing plant in the U.S.

DIED. Alfred Bloomingdale, 66, credit card tycoon and confidant to President Reagan; of cancer; in Santa Monica, Calif. In the '40s Bloomingdale was a producer on Broadway (Ziegfeld Follies) and an executive at Columbia Pictures. Heir to the Bloomingdale department-store fortune, he made his millions and started the credit card boom with the launching of Diners' Club in 1950. In July Vicki Morgan. 30, filed a $10 million palimony suit against Bloomingdale and his wife Betsy, claiming that Bloomingdale had promised her lifetime support during the twelve years she says she was his companion. He left his entire estate, which some have estimated at $50 million, to his wife and to a trust fund.

DIED. Dominic Tampone, 68, vice chairman of Hammacher Schlemmer, the innovative specialty store and oasis of elegant gadgets to the sedulous and casual collector alike; of cancer; in New York City. Beginning as a stockboy at 15, Tampone stayed on for more than 50 years encouraging inventors to bring even the most farfetched ideas to him. Among the once outrageous items his store popularized that have become staples of modern life: the steam iron, the portable radio, the Waring Blendor and the electric razor.

DIED. Sobhuza II, 83, king of Swaziland and the longest-reigning monarch in the world; in Mbabane, Swaziland. The autocratic but mild-mannered Sobhuza ruled his small, landlocked southern African nation of 550,000 by balancing observance of his country's ancient traditions with gradual introduction of modern technologies. A man of simple tastes, he shunned his two royal palaces, preferring to live at his kraal of mud huts and to sleep outdoors on warm nights on a reed mat. He is survived by more than 100 wives and an estimated 500 children.

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