On March 24, 1983, Sweden and the US released a joint issue of stamps to mark the bicentennial of the Treaty of Amity and Commerce. Each of the stamps depicts Benjamin Franklin. A facsimilie of Franklin's signature is seen above his right shoulder; to Franklin's left (viewer's right) is a facsimilie of the signature of Gustav Philip Cruetz - the two represented the US and Sweden, respectively. The signatures are symbolic of the two men who negotiated and signed the Treaty on his country's behalf. Also shown on the stamp is a depiction of Sweden's Coat-of-Arms/Royal Seal.
The stamp's design is the work of Swedish artist Dan Jonsson; it was engraved by Swedish engraver engraver Czeslaw Slania.
Following is a MNH plate block of the US 20-cent stamp (Scott #2040) and a pair of USPS-issued souvenir cards for the issue - one Mint, one Cancelled. The Mint card was issued at $2.00, the Cancelled card at $2.20 (to cover the cost of the affixed US stamp):



The First Day of Issue ceremony in the US was held at the American Swedish Historical Museum in Philadelphia, Pennsylvania (PA).
Sweden was the first
neutral European country to formally recognize the sovereignty of the fledgling United States (US), doing so on April 3, 1783, via the Treaty of Amity and Commerce (in Swedish: Svensk-amerikanska vänskaps - och handelstraktaten). France was the first country to formally recognize the US, via treaties signed on February 6, 1778 - France, of course, supported the American colonies during the American Revolution.
The US-Sweden treaty was signed five months before the September 3, 1783 Treaty of Paris between the US and Great Britain. (The 1783 Treaty of Paris formally ended the American Revolution and officially recognized American independence.)
The treaty between the US and Sweden was negotiated in Paris, France by the US' Benjamin Franklin, Minister Plenipotentiary to Sweden, and Sweden's Anbassador in Paris, Baron Gustaf Philip Creutz. In addition to Sweden recognizing the sovereignty of the United States, the Treaty granted "favored nation" status for trade between the countries and outlined other areas of cooperation.
You can read the full Treaty (in Swedish and English!) here:
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Founders Online: Swedish-American Treaty The Treaty was signed on March 5, 1783 in Paris by each country's representative but post-dated April 3, 1783 to ensure adequate time for the peace negotiations between the US and Great Britain to develop further. Sweden's King Gustav III ratified the Treaty on May 23, 1783, and the US Congress did likewise on July 29, 1783. The two countries exchanged final, ratified documents in Paris on February 6, 1784.
In follow-up posts I'll present several standalone and joint-issue covers plus the booklet for Sweden's stamp.
You can check out my covers regarding the friendly history of the US and Morocco and their early treaty of friendship:
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MoroccoI've also posted about the 1783 Treaty of Paris:
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Treaty of Paris Bicentennial