Tiểu sử bút mực Parker "51"

General Eisenhower holding to Parker "51s" in a V for the victory in Europe in 1944.

General McCarthur using a Parker "51" to sign the Japanese surrender in 1945


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Development of the Parker "51" was completed in 1939, the 51st anniversary of the Parker Pen Company, thus its name. Pre-production models were test-marketed in Venezuela, Colombia and other Caribbean countries in early 1940, before the pen's general introduction into the U.S. The places where the pen was test-marketed included Caracas and Maracaibo, Venezuela; Barranquilla, Columbia (as spelled by Parker in their ads); Port of Spain, Trinidad and Tobago; and Curacao, Netherland Antilles. These locations were picked because of the tropical climate and high humidity, extreme conditions usually not found in the U.S. These test-market pens looked essentially as the "51s" later introduced in the U.S. with a few differences 

Source: parker51 website