1/2 Oz Danbury Mint Decades of Progress 1990 Round PF

The Danbury Mint produced a series of 1 Oz and 1/2 Oz rounds commemorating significant achievements within each decade. The series was called Decades of Progress. The mintage for the rounds is unknown. 

Obverse: The obverse depicts five computers surrounding a globe criss-crossed with lines. The lines represent telecommunication infrastructure. The computer screens display the familiar URL of "HTTP://WWW". The phrase "UNITED STATES OF AMERICA" is inscribed at the top, with the decade "1990s" found at the lower left. The description "SPACE SHUTTLE PROGRAM" is inscribed at the bottom. 

Reverse: The reverse features the common design of the series. The central feature is a depiction of Bohr's atomic model. Surrounding the atom are images representing important inventions: a chemistry flask, a lightbulb, the gramophone, eyeglasses, a rocket, and the airplane. The motto "E PLURIBUS UNUM" is inscribed at the top, while the weight, purity, and content of "1/2 TROY OUNCE .999 FINE SILVER" is located at the bottom. The mint mark of "D/M" is centered within it.