This 5-1/4-inch galvano-negative was designed by Medallic Art Company co-founder Henri Weil in 1928 for the National Parks Foundation as the pattern for a 7/8-inch and 5/8-inch medal that would be sold at various US national parks. Medallic Art Company was incorporated in New York City 1910 and produced medallic work of exceptionally high quality and design into the present day. In the first half of the 20th century, medallic models would be sculpted from wax, clay, or plaster and made into a plaster positive. This plaster positive would be sprayed with an electrically conductive material and electrolytically plated with a heavy layer of pure copper to produce a copper negative called a galvano. This was placed on a Janvier mechanical pantograph machine that would cut the negative pattern into a soft steel block which would later be hardened into a die that would produce the medallion in a hydraulic or mechanical press. It is extremely rare for items like this to appear on the market, and it probably surfaced after the 2016 bankruptcy of Northwest Territorial Mint which had purchased Medallic Art Company in 2009. Approx 7 inches in diameter and weighs about 25 ounces.Date: 1928Country (if not USA): State: City: Provenance: