Gregory Louis (George) Giannetti, 84, an architectural sculptor who worked on the U.S. Capitol, the Washington Cathedral and other well-known building and who executed dozens of copies of the U.S., presidential and other official seals, died at Providence Hospital on Saturday following a stroke.He lived in Bethesda.

Much of Mr. Giannetti's work was making plasticene models or plaster casts of sculptures, friezes, ornaments and other architectural features. He also made seals and similar bas relief articles. Some of his work later was copied in stone, marble or bronze. He did restorative work in the White House. In rare cases, such as the making of some seals, Mr. Giannetti also would paint them.

The U.S. Seals he made included those used in the inauguration of President Dwight D. Eisenhower in 1953. Various others that he executed are on display in U.S. embassies around the world and elsewhere.

Mr. Giannetti was born in Riolo, a village in the provice of Lucca, Italy. In 1910, he came to the United States and settled in New York City. During World War I, he was a chauffeur in the Italian army. In 1919, he returned to this country and lived in New York and Philadelphia. In 1926 he moved to Washington and remained in this area for the rest of his life.

His first job here was with the firm of Lombard & Ludwig Inc. In 1935, he started his own business, Giannetti's Studio, formerly of Washington and now of Brentwood. He retired in the mid-1970s and the company is operated by his two sons, Robert L., of Adelphi, and John A., of Berwyn Heights.

Mr. Giannetti received several acheivement awards from the Washington Building Congress.

A former resident of Mount Rainier, Mr. Giannetti was a past president of the Mount Rainier-Brentwood Lions Club, the Mount Rainier Citizens Association and the D.C. Chapter of the Italian World War I Veterans of America. He received an Outstanding Achievement Award from the Mount Rainier Lions Club in 1961. He was a member of the Mount Rainier and Chillum Democratic clubs, the Roma Lodge of the Order of the Sons of Italy and Italian Culture Society.

Mr. Giannetti was a former member of the parish of St. James Catholic Church in Garrett Park and its Men's Club. He also was a 4th Degree member of the Knights of Columbus and a member of Council No. 2809 of the Knights of Columbus in College Park.

His first wife, Bruna L. Giannetti, died in 1971.

In addition to his sons, suvivors include his wife, the former Rose Gay, of Bethesda; three stepsons, Henry Gay of Rockville, Frank Gay of Glen Burnie, and John Gay of Gaithersburg; one daughter, Joan Broglio of Adelphi; a sister, Cristina Farina of Rome; 10 grandchidren, 13 stepgrandchildren, and two great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Carmelite Sisters, Carmelite Convent, 1600 Webster St., NE., Washington, D.C.