Celebrate one of the early human space missions with this one-of-a-kind Sterling Silver necklace based on the logo for NASA's Mercury-Atlas 8 Mission. According to NASA, "Schirra named his capsule Sigma 7, after the Greek letter Σ often used in engineering and mathematics to symbolize summation, and the “7” representing the seven Mercury astronauts."
 
The NASA photo above shows Sigma 7 artist Cecilia "Cece" Bibby as she painted the mission logo onto the spacecraft. 
 
The Sterling Silver paperclip chain measures 18" long, plus the 7/8" long hand-cut Sterling Silver Sigma 7 logo/attachments. The Sigma 7 logo measures 22x10mm.
 
Proudly designed and manufactured in Wichita, KS. #MadeInICT