Eterna-Matic 1422 automatic watch

A rare black dial Eterna-Matic. The dial has a light spot-like patina. The case has signs of age and use and there is an engraving on the caseback. The crown is original and the leather strap has been used. Service history is unknown, but the watch works well. Date quick set works by repeatedly pulling the crown to its furthest position and the watch is running approximately +- 10 seconds per day.