The contributions made by two prominent black leaders highlight this week's U.S. stamp news.

The new issues are a 15-cent post card in the Historic Preservation Series and a 25-cent commemorative in the Black Heritage Series.The card honors Georgetown University's Healy Hall in celebration of the 200th anniversary of the school's founding. The building is named for Patrick Healy, who strove to make the college an outstanding institute of higher education and was the first black president of a major American college.

The card shows a view of Healy Hall featuring its 312-foot stone face and one side of the building. Prominent in the design, as well as on the campus, is the 209-foot lookout tower that has dominated the Georgetown skyline since 1881.

"USA 15" appears along the upper portion of the sky. At the lower left of the card in four lines are "Healy Hall," "Georgetown," "Washington, DC" and "HISTORIC PRESERVATION."

First-day cancellations of the Healy Hall card may be obtained as follows:

Collectors desiring to buy the card (sold primarily at Philatelic Centers only) may send the self-addressed cards to: Customer-Provided Postal Cards, Postmaster, Washington, DC 20066-9991. Requests must be postmarked by Feb. 22.

If you prefer to buy cards directly from the Postal Service, send a check or money order for 15 cents per card (limit is 50) and a peelable self-addressed label for each card to: Healy Hall Postal Card, Postmaster, Washington, DC 20066-9992. The deadline is Feb. 22.

The new 25-cent commemorative pays tribute to A. Philip Randolph, who for years was a resounding voice for the rights of minority labor. The adhesive is the 12th in the Black Heritage Series.

Randolph (1889-1979) was born in Crescent City, Fla. In 1925, he embarked on a campaign to organize the Brotherhood of Sleeping Car Porters. His perseverance paid off in 1937 with the first contract signed by a white employer and a black labor leader. In 1963, he directed the famed March on Washington for Jobs and Freedom, which is best remembered for the historic speech by the Rev. Dr. Martin Luther King Jr.

The new stamp bears a portrait of Randolph. A smaller image of a train of Pullman cars and three sleeping-car porters in white jackets is superimposed on the lower portion of the design. "A. Philip Randolph" and "25" appear above the portrait, while "Black Heritage USA" is seen below.

First-day cancellations are available in the ususl two methods:

You may buy the stamp at your local post office and affix to your own envelope. Send to Customer-Affixed Envelopes, A. Philip Randolph Stamp, Postmaster, New York, NY 10199-9991. No remittance is required. The deadline is March 5.

If you prefer to buy directly from the Postal Service, enclose your request with a check or money order for 25 cents per stamp and send to A. Philip Randolph Stamp, Postmaster, New York, NY 10199-9992. The deadline is March 5.

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Israel has issued three new stamps of historic significance to its people.

The first stamp honors Moshe Dayan, famous Israeli general and statesman. A decisive and brilliant military leader, Dayan is well-remembered as a foreign minister who played a central role in the Camp David Conference and the signing of the peace treaty with Egypt. Dayan's portrait appears as the main design of the new stamp. The tab bears his name in Hebrew and his dates, 1915-1981.

The second stamp is dedicated to the Jewish Legion, whose members fought so bravely within the framework of the British army during World War I. The stamp features a photo of the Legion with a large menorah in the foreground.

The thrd stamp commemorates the 50th anniversary of Kristallnacht, "The Night of Broken Glass," a horror-filled night in Nazi Germany when rampaging mobs killed many Jews and destroyed synagogues, homes and shops. The main design illustrates the synagogue at Heilbronn-Boeckingen, which was burned to the ground that night.

The set of three stamps can be ordered at $6.95, and first-day covers at $14.95, from the Israel Stamp Society, P.O. Box 917, Van Nuys, CA 91408.