A retro favorite returns: This Casio A100 Digital Watch is a reissue of Casio’s F100, originally released in 1977. The first watch to be made entirely of resin, including the caseback, the F100 had a big screen moment when Sigourney Weaver wore it Ridley Scott’s 1979 blockbuster, Alien. This new reissue includes the same functions as the original, with the addition of a steel bracelet. The four-button function allows you to control and select Settings, Light, Calendar and Chronograph.