The stamp commemorating Charles A. Lindbergh's solo transatlantic flight will be issued May 20 on Long Island, NY., near the site of old Roosevelt Field, from which the "Spirit of St. Louis" took off in 1927.

This announcement was made Monday by Assistant Postmaster General Robert H. McCutcheon, who represented the Postal Service at a design unveiling ceremony at the Smithsonian Institution's National Air and Space Museum.

The first day of issue ceremony will take place at Eisenhower Park, immediately adjacent to the site of Roosevelt Field. Lindbergh flew over what is now the Eisenhower Park area as he took off May 20, 1927.

Anne Morrow Lindberg will receive an album containing a pane of the stamps honoring her late husband's flight the evening of May 20 from Postmaster General Benjamin F. Bailar. The presentation will occur during the "Spirit of St. Louis" dinner held at the Waldorf Astoria Hotel by the Charles A. Lindbergh Memorial Fund.

The Lindbergh flight golden jubilee stamp was designed by Robert E. Cunningham of Fort Worth Tex., who also did the Commercial Aviation 50th anniversary stamp last year. Cunningham's design shows the "Spirit of St. Louis" low over the water between Nova Scotia and Newfoundland in the ninth hour of the flight. The setting sun appears behind the right wing of the aircraft.

At the upper right, in blue, appears "USA 13c," and below the aircraft, in one line of black type, appears "50th Anniversary Solo Transatlantic Flight." Esther Porter of the Bureau of Engraving and Printing, modeled the Lindbergh stamp, which will be in standard commemorative size, arranged horizontally, with six plate numbers per pane.

Although first-day cancellation orders are to be sent to the Postmaster in Garden City, the cancellation will read "Roosevelt Field Station, NY 11530."

Collectors desiring to arrange for their own first-day covers may purchase the new Lindbergh stamp at their local post office, affix the stamp (or stamps) to the [envelopes] and send their addressed envelopes to "First Day cancellations, Postmaster, Garden City, NY 11530" for cancellation and return through the mailstream.

Those who wish Postal Service to affix the stamp (or stamps) should send addressed envelopes with check or money order covering stamps to be affixed (13 cents apiece) to "Lindbergh Flight Stamps, Postmaster, Garden City, NY 11530."

In either instance, prepared covers or oders must be postmarked no later than June 4.

One of two covers flown aboard Lindbergh's New York to Paris flight, sold at auction March 23 by Robert A. Siegel, brought $35,000. The letter was carried for Gregory J. Brandeweide who, Lindbergh states, "worked with me laying out the mail route."

The second cover flown with Lindbergh was for Postmaster Conkling of Springfield (Missouri). Lindberg is recorded as stating before his takeoff, with specific reference to the Conkling cover that "I couldn't say no to him."

A total of $1,118,875 was realized at the March 23 Siegel "rarity" auction in New York's Hotel Pierre.A well-centered copy of the 24-cent airmail invert brought $35,000.

Lots 13 and 14, comprising an unused Brattleboro, Vt. postmaster's provisional ($12,000 catalog value), and a complete reconstruction of 10 plate positions as known (catalogued at $40,000-plus), were combined and sold for $85,000.

A vertical pair of the 10-cent St. Louis Bears on folded letter sheet, valued at $5,000, went for $7,000, and a unit of four 5 and 10-cent Bears, listed at $16,500 plus, realized 19,000.

A used 15-cent 1869 invert cataloging $7500 brought $6,000; a 24-cent invert of the same issue, also used ($6,500 catalog) sold for $7,500; a remarkable well centered used 30-cent 1869 invert ($25,000) went for $23,000, and another example with a couple of tears realized $17,000.

A used copy of the 1-cent blue imperforate of 1851, Type 1, described as "one of the most attractive known examples of this rare stamp" (Scott No. 5), listed at $8,750, was sold for $13,000.

National stamp shows are coming up in droves as the weather improves, and will peak this month and on through the end of May.

One especially popular display will take place Apil 15-17 at Atlantic City's Marlborough-Blenheim Hotel, sponsored by the Association of South Jersey Stamp clubs. Participating societies at this year's Sojex show will be the Postal History Society, New Jersey Postal History Society, and the Mobile Post Office Society.

The Society of Philatelic Americans and the Dwight D. Eisenhower Philatelic and Historical Society will be among the grups convening during Napex (National Philatelic Exhibitions of Washington) May 6-8 at the Marriott Twin Bridges Hotel just across the potomac.

Denver's Rompex (Rocky Mountain Philatelic Exhibitions) show May 20-22 will be highlighted by the spring convention of the German Philatelic Society, and will have a Bureau of Engraving and printing exhibit, and a Bureau souvenir card. The show and bourse will be held at the Regency Inn.

On May 27-29 it will be the turn of the Federated Stamp Clubs of Central New Jersey to stage its annual Cenjex show May 27-29 at the Ramada Inn, East Brunswick. The national convention of the Society of Israel Philatelists will be held in conjunction with the show.

Chicago's annual Compex show will be held over the Memorial Day weekend (May 28-30) as usual, but this time at the Palmer House. COINS

The Bureau of the Mint's San Francisco facility is expected to start mailing out 1977 proof sets early this week - perhaps even tomorrow. Orders were accepted as of Friday, and will continue to be accepted until the West Coast Assay Office feels it production facilities have been matched.

Production of this year's proof coins has been underway for weeks, so the Assay Office already has a good supply to permit prompt filling of the first orders. The Mint has found that the vast majority of orders are received within the first three weeks, so a backlog will develop quickly.

Frank H. MacDonald, acting director of the Mint, has stated that production of proof coin sets will continue on a year-round basis, which the Mint has found to be the most economical method of manufacture.

Proof coins require special handling. They ara double struck on highly polished blanks that produce a mirror like finish and higher relief. Acceptance of all orders, therefore, is contingent upon the Mint's ability to meet an unpredictable demand.

Orders for 1977 proof sets are limited to five per individual, and payment by check or money order payable to the Bureau of the Mint must accompany each order. The price of the 1977 set has gone up to $9 because costs for materials, manufacturing and distribution have escalated.

Orders for 1977 proof sets may be sent to the Bureau of the Mint, 55 Mint st., San Francisco, Ca 94175.

Treasury, and its Bureaus of the Mint and Engraving and Printing, are having Problems. The Bureau of the Mint, as an example, has noted that it is hurting because of a coin production rate substantially in excess of the nation's needs.

In almost the same breath, the Mint plans to strike 13.7 billion new coins to meet current and anticipated demand. This total output includes provision for 10.4 billion cents, and 90 million $1 coins.

Frank H. MacDonald, acting director of the Bureau of the Mint, has indicated to the Senate Appropriations Committee and a House subcommittee on Appripriations that the existing dollar and half-dollar appear to have no future roles in the coinage system.

MacDonald is also quoted as stating that the heavy production of dollar and half-dollar coins "satisfies a numismatic demand, with most coins produced being withdrawn immediately from circulation." Yet there are reports that Federal Reserve Banks across the country are overstocked, especially with the dollars.

The Bureau of the Mint also has observed that about 15 million part-silver Bicentennial coins remain in its vaults. Congress, which ordered the striking of 45 million part-silver Bicentennial coins, will probably be asked to authorize destruction of the excess stock because of storage costs, and the continuing surface deterioration of the coins.

The Bureau of Engraving and printing is having its own problems with the $2 bill. Coin World has indicated that almost half of the 415,000,000 notes printed still remain out of circulation.

James A. Conlon, director of the Bureau of Engraving and Printing, continues to support the $2 billion as an economical monetary unit, even though acceptance on a nationwide basis has been referred to as "dismal."

Curiously, the Bureau of the Mint proposed to aggressively seek contracts to produce coins for friendly foreign nations, to utilize "excess production capacity profitably."

The Royal Canadian Mint is currently circulating reservation forms for its numismatic products. One item listed is the dollar commemorating the 25th anniversary of Elizabeth II's accession to the thorne.

A listing of numismatic items available and a reservation form may be secured from Coins Uncirculated, P.O. Box 457, station A, Ottawa, Ontario KIN 8V5, Canada.

Elsewhere, one of the five known specimens of the 1913 Liberty nickel is on the market for $225,000. It is stated to be the speciment featured in a recent "Hawaii FIVE-O" television program.

The first public sale of a 1913 Liberty nickel was for $900 in the late 1930's. This particular coin sold in 1944 for $3,750. The price for another specimen was $46,000 in 1967, and successive sales were for $100,000 in 1972 and $135,000 ealier this year.