STS-57 - 4" - hallmarked - unknown maker

STS-57 was a Shuttle-Spacehab mission of Space Shuttle Endeavour that launched 21 June 1993 from Kennedy Space Center, Florida.

During the course of the ten-day flight, the astronauts successfully conducted scores of biomedical and materials sciences experiments inside the pressurized SPACEHAB module. Two astronauts participated in a spacewalk and EURECA (European Retrievable Carrier) was retrieved by the crew and stowed inside Endeavour’s payload bay. EURECA was deployed from the Space Shuttle Atlantis in the summer of 1992 and contains several experiments to study the long-term effects of exposure to microgravity.

The five stars and shape of the robotic arm of the insignia symbolize the flight's numerical designation in the Space Transportation System's mission sequence.

This patch has a "57" embroidered in the blue field of the ocean. 

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