My new favourite and my current daily beater. SEIKO Automatic Chronograph 6139-6011. The first automatic chronograph in the world. Released silently in early 1969 during "the Great Race of 1969" where Heuer-Leonidas/Breitling/Buren/Depraz & Cie/Hamilton consortium was competing with Zenith to produce world's first automatic chronograph.
Production date: December 1970. Missing the original bracelet, but everything else is original and untouched. Very beautiful.
▲ Scan from "SEIKO Heritage".