Avia-SILVANA, membre du groupe SGT

European Watch Clock and Jewellery Fair 1973 BF 303
All-electronic solid state technology (no moving parts) : the electronic wristwatch with liquid crystal digital display. Normally transparent, these crystals become opaque when energized by an electric field controlled by a tiny computer which processes and transmits impulses from a small quartz rod vibrating 32,768 times a second. (AVIA-SILVANA, a member of the SGT Group)