A HISTORIC saucer worth $20,000, an antique secretary-book-case worth $100,000 and six cases of half-gallon bottles of Yellowstone Kentucky Bourbon ($58.50 a case) are among the gifts and loans that now bring the value of the Americana project at the State Department up to $19 million.

The saucer is of Chinese export procelain, a part of the Martha Washington States service, made about 1795 to 1800. It is the gift of the late Elizabeth Renshaw of Kentnett square, Pa.

The saucer is decorated with the names of 15 states - Massachusetts is msspelled. In the center are the initials MW for Martha Washington.

The secretary-bookcase has been at the State Department for several years - on loan. But now it and other treasures of the samde donor have been made an outright gift. The donor is Maryland McCormick, who once lived here in Washington but now is back in Chicago. Value of all the gifts from the widow of the late publisher of the Chicago Tribune is placed at $200,000.

The secretary-bookcase came from the Marblehead, Mass., mansion of the late Robert "King" Hooper. His was one of the great houses of his day. Hooper, a merchant and shipping magnate, was said to have run his successful business from his desk. The American chippendale desk was made in Boston about 1765. McCormick's first husband was a Hooper.

These and many other items acquired this year by the Fine Art Committee of the State Department were on view Thursday night at the reception at the State Department given by Grace vance, wife of the Secretary of State. Clement E. Conger, chairman of the Fine Arts Committee and curator a the White House, presented the donors and lenders to Vance. The $351 gift of bourbon, from the Glenmore Distillery Co. of Louisville, Ky., was consumed during the reception.

A Chinese export dinner service (made about 1780) of 110 pieces was on view as the gift of Evangeline Bruce. She is the widow of David Bruce, the late American diplomat who served as the first American ambassoder to the Liaison Mission in Peking.

A life-size bust of John Jay, who was really the second Secretary of State, by the Italian sculptor Guiseppe Ceracchi (1751-1802) is the gift of the Morris & Gwendolyn Cafritz Foundation. The bust was done in Philadelphia about 1791 in plalstic materials and was transferred into marble in Rome about 1791-1792.

A rare portrait of Lafayette with a horse by Louis Leopold Boilly is the gift of Mr. and Mrs. Claus Von Bulow of New York. They gave the $140,000 to buy the unusual work.

The several hundred donors and lenders stepped into the middle of the latest renovation at the State Department. This is the $850,000 remodeling of the 8th-floor entrance hall facing the elevators.

Some $800,000 more in additional funds will be needed, Conger said, to complete the restoration of other rooms in the 8th-floor hospitality suite before 1980. Still to be revamped in keeping with 17th-and 18th-century antiques are the men's and women's lounges, and two smalaler rooms used by the Secretary of State. All the major hospitality rooms have now been remodeled in federal period design.